Tennis Betting Tips - How to Read Form, Find Value and Choose a UK Bookmaker

Updated October 2026

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Tennis betting tips sell certainty the sport does not offer. A favourite wins roughly two thirds of the time at the top of the men’s game, the outsider lifts the trophy about a third, and the gap closes sharply on clay or in early rounds. Anyone who tells a reader they have a “sure” pick is selling a feeling, not an analysis. The honest job of a guide is narrower: explain how a tip is built, what a price is really saying, how a bookmaker’s margin eats into every line, and which UK-licensed operator gives the bettor the cleanest way to act on their own view. That is the work this page does. The details on tournaments and licence numbers provided here are consistent with the latest figures, ensuring the information remains reliable throughout 2026.

*Current as of 27 October 2026 · verified against the Gambling Commission’s public register of remote licence holders and operator terms pages.*

Bonuses and Free Bets for Tennis

The welcome offer is the loudest thing on a bookmaker’s homepage and one of the worst signals of value. “Free bet”, “risk-free”, “100 % bonus” – the marketing word is rarely the price, and the price is what costs the bettor. Two figures matter most: how much of the bonus the customer must turn over before it pays out, and the minimum odds on the bets that count. A third figure – the deadline – decides whether most customers ever reach the payout at all.

UK-licensed bookmakers now operate under a 10x cap on bonus turnover introduced on 19 January 2026: a £10 bonus requiring 50x wagering, £500 of qualifying bets, becomes impossible to offer in that form, and at the cap the upper bound is £100 of bonus turnover. That ceiling reshapes the market, but it does not erase the conditions underneath it. A “£40 in free bet tokens” package credited on settlement of a first qualifying bet still demands four tokens, each with its own expiry, and the stake is rarely returned when a free bet wins. A “Bet £10, Get £10 in Free Bets” structure with a 7-day expiry and minimum odds written into the small print lets a casual customer lose the whole thing inside a working week. Mixed-product promotions – offers that require gambling on betting plus casino, bingo or lottery to clear – are banned under the same January 2026 rules, so an offer the customer must clear partly through slots is no longer a betting bonus at all.

What the bonus costs is not the headline. Take the example of a £10 free bet at minimum odds of 2.00 whose stake is not returned. The price tells the reader what the bet pays if it wins: £10 × (2.00 − 1) = £10 of profit, before the bookmaker’s margin on the market is applied. The cost is what the offer is worth on average across the markets the bettor actually uses. A bookmaker whose tennis margin runs to 6 % keeps 6p of every pound wagered across the match, and a free bet’s value is reduced in proportion. A reader who clears a £40 free-bet package over four bets at average odds of 3.00 and a 6 % tennis margin is looking at roughly £8-£12 of expected value, not £40 – a long way from the £40 the homepage flashes. The offer is a kicker on top of a price the bettor would have taken anyway, not a reason to take a worse one.

A welcome offer is a reason to try an operator, never a reason to back a player. A punter who treats the bonus as a marketing cost – what the bookie spends to recruit them – reads the small print once, notes the minimum odds and the deadline, and picks markets they would have picked without the offer. Anyone who lets the bonus change the market is paying for the privilege in lost edge.

Mobile Apps and the Tennis Betting Slip

A betting app is a thin layer over the same markets, the same prices and the same licence – the Gambling Commission authorises the operator, not the App Store listing. What an app decides is how fast a bettor gets from a flash of interest to a confirmed slip. On tennis, where live odds shift point by point, that gap matters.

The serious tennis app needs four things working together. First, in-play markets that update inside a single rally rather than between games. Second, a bet builder or same-game multi that lets a punter combine match winner, set score, total games and player performance markets without leaving the event page. Third, a stable live stream or a tracker that shows serve direction, break points and momentum, because betting on tennis without watching the match is the textbook way to overpay for stale prices. Fourth, a partial cash-out that lets the punter close part of a position mid-match, locking profit or cutting loss without exiting fully. The four features are common enough now that their absence is the differentiator, not their presence.

Two structural points the punter should weigh before downloading. App-only bonuses sometimes exclude the bettor who plays on the desktop site, and free-bet tokens credited in-app may carry a shorter expiry than those issued elsewhere. Touch ID and Face ID logins speed sign-in but sit alongside, not in place of, full identity verification: a UK-licensed bookmaker verifies name, address and date of birth before the first deposit and before any bet settles. The customer who finds verification annoying is the customer the rules were written for – they are also the customer GAMSTOP is built to help.

An app that crashes during a tiebreak, freezes the slip while odds move, or refuses to settle a winning bet in under a minute is a worse product than its feature list suggests. Read recent reviews on the App Store, not the marketing screenshots; the failures show up there.

Live Betting and Cash Out on Tennis

Tennis is the most bettor-friendly sport for live wagering. There are no time-outs of length, no stoppages for substitutions, no injury clock to game the market: between serves the bookmaker updates prices, and a break of serve shows in the odds inside a single game. A punter who reads momentum well can price a set before the market catches up. The cost of that edge is the in-play margin, which is almost always wider than the pre-match margin: live books charge the customer for the speed of the price feed.

Cash out is the bookmaker’s pre-commitment to buy the bet back at a calculated price mid-match. Two things decide its real value. The first is whether the cash-out price is competitive with the live market – it often is not, because the bookie holds a wider spread on the cash-out button than on the same selection in the open market. The second is whether partial cash-out is offered. A punter who can lock half the profit and let the other half ride keeps the upside of a comeback while removing the worst-case downside of a collapse. Full cash-out at a thin price is the marketing-friendly version; partial cash-out at a fair price is the punter-friendly one.

Live streaming is the cheapest edge a serious tennis bettor can buy. Watching the match lets the punter see a player holding a thigh, serving at half pace, or arguing with the umpire over a line call – information that moves through the live odds only after the price feed processes it. A bookmaker that streams ATP, WTA and Challenger events without a stake requirement gives the customer a paid feature for free. A bookmaker that requires a funded account or a recent bet before unlocking the stream is the standard arrangement, and a reader should expect it.

Three live-betting rules worth keeping. Never bet a set in-play at the price on the screen when a server has just held at love; the price has already tightened, and the next point is yours to lose, not to win. Never stack cash-outs as a “guaranteed profit” trade – the cash-out price is the bookie’s price, and a sequence of small guaranteed profits erodes the punter’s edge faster than a sequence of bets would. Never bet a player to win from two sets down without checking the live stream; comebacks happen, but the price on a two-sets-down recovery almost always overpays for the rarity.

Predictions, Strategy and the Honest Limits of a Tip

A tennis tip is a story about form, surface, head-to-head, fatigue and price, and no part of the story is certain. Form fades on the wrong surface: a hard-court grinder who lands on clay in April is a different player from the one who won Indian Wells in March. Surface is the most reliable variable in the men’s game: serve-heavy players win more free points on grass than on clay, returners flip that lead. Head-to-head matters when the gap is large and the sample is deep; it means little after three meetings. Fatigue is the underrated input – a player through a deciding set the day before is half a level down on day two, and the early-odds market rarely prices that correctly in early rounds.

Bankroll discipline is what separates a tipster who lasts from a punter who does not. A punter who stakes 5 % of bank on a “best bet” and 1 % on a speculative outsider survives a losing streak; a punter who doubles down on a hot tip and chases with 20 % does not. A flat staking plan – the same stake on every selection at the same odds band – removes the temptation to overbet a tip that “feels right” and underbet one that does not. Record-keeping is the other half: the punter who logs every bet, the closing price, the result and the reason for the bet learns where their edge lives. Without the log, the tip is a vibe.

The deeper honesty: no tip is ever certain. Tennis is the sport where upsets are priced into the odds for a reason, and a “lock” at 1.20 is one good return of serve from being a loser. Anyone selling tips as certainties is selling a feeling. A reader who wants to bet on tennis for entertainment pays for the privilege with the margin baked into every price, and the margin is the only certainty on the page.

Bet Types, Odds and What the Margin Does

The account number for the price is the margin. A bookmaker’s margin – also called overround – is the cut the book keeps from every market, and it is the same number whether the match is Djokovic vs Alcaraz or a Challenger final in Tampere. The simpler the market, the easier it is to see. On a two-way match winner at decimal odds 1.90 / 1.90, an illustrative example rather than a quoted price, the implied probabilities sum to 1 ÷ 1.90 + 1 ÷ 1.90 = 0.5263 + 0.5263 = 1.0526. That sum above 1.00 is the margin: roughly 5.3 %, which is the band a typical pre-match tennis market occupies. State it as a band – a pre-match tennis margin sits in the 4-7 % range at most UK-licensed operators, with live markets wider and outright futures wider still.

The margin explains why the same match has different prices at different bookmakers. A 5 % margin and a 7 % margin on the same fixture are 2 percentage points of expected value to the punter across every bet they place, and over a season of tennis that gap compounds. A reader who picks the bookmaker with the consistently tighter tennis margin keeps more of their edge for the same picks – that is the single most useful piece of arithmetic on this page.

Tennis offers more markets than almost any other sport, and each carries its own margin. Match winner is the cheapest. Set betting, total games, total sets and handicap lines sit a step wider. Player performance markets – aces, double faults, first-serve percentage, breaks of serve – run wider again because the bookmaker’s model is thinner. In-play markets are widest of all. The punter who bets match winner keeps more of their stake, on average, than the punter who bets a player to hit over 12.5 aces, even at the same operator.

Odds come in two forms in British usage. Fractional odds of 5/1 mean a £1 stake wins £5 of profit plus the £1 stake back, for a £6 return. Decimal odds of 6.00 say the same thing in one number: a £1 stake returns £6, of which £5 is profit. Conversion is mechanical – a/b in fractional becomes a ÷ b + 1 in decimal, so 5/1 becomes 6.00 and 11/4 becomes 3.75. Odds-on selections are shorter than evens (1/1 in fractional, 2.00 in decimal), and the punter risks more than they stand to win.

For a combination bet – an accumulator, a “acca”, a bet builder – the odds of the legs multiply into one price. A four-fold at legs of 1.50, 1.80, 1.65 and 1.40 carries combined odds of 1.50 × 1.80 × 1.65 × 1.40 = 6.237, meaning a £10 stake returns £62.37 if all four win. The margin of the accumulator is wider than the margin of any single leg, because each leg carries its own margin and they compound. The longer the accumulator, the wider the margin, the lower the punter’s expected value. A bet builder across one match is a smaller accumulator and a smaller penalty; a six-fold across six different sports is a different product entirely.

A value bet is a price above the true probability once the margin is removed. The bookmaker says Alcaraz is 1.80 to win; remove the margin and the implied true probability is around 53 %. If the punter’s own model says 58 %, the price is value. The model is wrong as often as it is right, and the punter who records their bets and tracks closing prices learns the size of their own edge the hard way. Without the log, “value” is a feeling dressed as arithmetic.

Tournaments, Surfaces and the Tennis Calendar

Tennis runs almost every week of the year, and the calendar shapes the betting as much as the form book. The four Grand Slams – Australian Open on hard courts in January, French Open on red clay in late May and early June, Wimbledon on grass in late June and early July, and the US Open on hard courts in late August and early September – are the events the markets price deepest. Wimbledon 2026 ran from 29 June to 12 July 2026 on grass, with the men’s and women’s titles both decided at this edition. Outside the Slams, the ATP 1000 and WTA 1000 Masters events draw the strongest fields and the sharpest prices. Challenger and ITF events run thinner markets and wider margins, and they are the events the serious punter watches for form rather than bets on.

Surface is the single most predictive variable. Clay slows the ball, lengthens rallies and rewards defenders; grass keeps the ball low, shortens rallies and rewards servers. Hard courts sit between, with the speed varying – the US Open courts play faster than the Australian Open courts. A player who wins 70 % of service games on clay might win 85 % on grass, and the betting market prices that gap, often imperfectly in early rounds. The punter who knows the surface effect prices their own model ahead of the closing line.

Match format matters for betting. Men play best of three at almost every event and best of five only at the four Slams. Women play best of three everywhere. Best of five means a stronger favourite on a slow surface, because the favourite has more sets to wear the underdog down; best of three means a fatter underdog price, because one hot set is enough. A deciding-set tiebreak at 6-6 is the standard rule; some events use a match tiebreak, first to ten with a two-point lead, in place of a third or fifth set. The punter who bets set score or total games should know which rule is in force.

A tennis game runs 0 (love), 15, 30, 40. The first player to four points with a lead of two takes the game; at 40-40 the score is deuce and a player must win by two. A set is usually won by the first to six games with a margin of two, with a tiebreak at 6-6 played to seven points with a two-point lead. These are the basic units every tennis market prices against, and a punter who cannot read them reads the markets through fog.

Top 10 UK Tennis Betting Sites Compared

The ten operators that follow hold a current remote general betting standard (real events) licence on the Gambling Commission’s public register as at 27 October 2026. Each one runs a tennis book, accepts GBP and operates GAMSTOP. The list is a review set, not a ranking – none of them is “the only” licensed operator, and a place in this comparison is not a licence.

The table is a snapshot of the licences and the operator’s own stated tennis features. What it cannot show is the price – the margin on Djokovic vs Sinner at one operator versus another – and that is the figure that decides the punter’s long-term edge. A reader comparing two operators should check the price on three upcoming matches across the day, at match winner, set betting and total games, before deciding. The margin differences across that small sample are usually larger than the welcome-offer difference.

BetVictor

BetVictor runs a deep tennis book across the ATP, WTA and Challenger tours, with Smart Stats giving form, head-to-head and serve/return numbers alongside the markets. The Best Odds Guaranteed feature applies to UK and Irish horse racing, not tennis, so the tennis value here sits in the price itself rather than a price promise. BetFinder is a racing tool rather than a tennis one, useful for the punter who plays both sports.

The verdict: a clean choice for the punter whose edge lives in pre-match pricing rather than in-play trading. Smart Stats is the closest thing to a punter’s notebook the operator offers, and the markets behind it are competitive.

Dabble

Dabble’s site centres on a social feed where punters follow tipsters and copy bets, with the welcome offer built around a single qualifying bet at minimum odds and a 7-day free bet expiry. The stake on a winning free bet is not returned, so a winning £10 free bet at 3.00 pays £20 of profit, not £30. The platform suits the recreational punter who likes the social layer more than the closing line.

The verdict: a social product first and a sportsbook second. The tennis market is narrower than the established operators, and the welcome offer is a reason to try the platform rather than a reason to back a player on it.

bet365

bet365’s tennis offering is the deepest in the comparison. In-play markets cover match winner, set winner, current game, total games in the set, total sets, player aces, double faults and a long list of performance markets. The live stream covers most ATP, WTA and Challenger events for funded accounts, and Bet Track and Match Live give the punter the rally-by-rally picture even when the stream is unavailable.

The verdict: the operator a serious in-play tennis punter keeps an account with for the streams and the market depth. The pre-match tennis margin is competitive rather than the tightest, and the in-play margin is wider than the pre-match one as it is everywhere.

Betway

Betway’s £40 welcome package splits into four £10 free bet tokens, each with a 7-day expiry and minimum odds of 2.00 on the qualifying bet. Debit card deposits only – e-wallets and prepaid cards do not qualify – which is a real restriction for the punter who uses PayPal or pays by bank transfer. The sportsbook covers the four Slams and the Masters events with a standard market set.

The verdict: a familiar choice with a four-stage free bet that rewards the punter who plans their first week. The debit-card restriction is the kind of detail that turns a £40 headline into a £10 reality for the wrong deposit method.

10bet

10bet’s tennis book covers the Slams, the ATP and WTA tours and a long tail of Challenger and ITF events. Cash Out, Bet Builder and Live Streaming are the headline features. The platform suits the punter who wants one app for pre-match, in-play and same-game multis without switching operator.

The verdict: a mid-market sportsbook with all the standard features wired up. The differentiator is the breadth of the Challenger coverage, and the punter whose edge lives in early-round underdogs gets the most from it.

BetGoodwin

BetGoodwin is a smaller British operator, and its tennis book runs the Slams and the main tour events rather than the Challenger tail. The Best Odds Guaranteed feature applies to UK and Irish horse and greyhound racing up to £1,000, and the welcome offer centres on racing rather than tennis. The sportsbook is a clean secondary product for a punter whose primary interest is the racing calendar.

The verdict: a racing-first operator with a competent tennis book attached. The tennis punter looking for Best Odds Guaranteed on tennis is looking at the wrong sport here.

Octobet

Octobet’s tennis book covers the Slams and the main tour events with a standard market set, and the Best Odds Guaranteed feature applies to UK and Irish horse racing up to £150 per customer per race. The site is a recent entrant to the UK market, and the app carries the operator’s full sportsbook and casino under one roof.

The verdict: a clean tennis book on a newer platform. The punter comparing prices across operators will find Octobet competitive on the Slams and the Masters events, and the welcome offer terms are the place to check before signing up.

Paddy Power

Paddy Power’s tennis offering is built around Bet Builder+ and the Super Sub feature, which rolls a bet over to a substitute player if the selected player is substituted before the bet settles. The feature is rare across the industry and turns a common edge case into a recovered stake. Expanded Win More markets cover match winner, set winner, total games and player performance, with player and ACCA stats feeding the betting slip.

The verdict: the operator a punter who builds same-game multis keeps at the front of the rotation. Super Sub is the single most useful feature for bet-builder punters, and the price underneath the markets is competitive on the Slams.

VBet

VBet’s app carries Bet Builder, pre-match and in-play betting, live streaming and a live calendar with results and stats. The tennis book covers the Slams and the main tour events, and the in-play markets on the bigger matches run deep enough for the live trader. The platform is built by SCGO Limited, which also runs other UK-licensed brands.

The verdict: a competent mid-market operator with a strong in-play product. The punter looking for a clean live tennis book on a smaller platform gets value here, especially on the ATP Masters events.

Betfred

Betfred’s app carries Bet Builder, Sub Switch, Racing Post data and Extra Places, with the live casino and bingo products sitting alongside. The tennis book covers the Slams and the main tour events, and the price is competitive on match winner and set betting. The platform is the high-street bookmaker’s online product, with the brand recognition that brings.

The verdict: a familiar choice for the British punter, with a strong racing product and a competent tennis book. The punter whose primary sport is racing gets the most from the platform, and the tennis offering is the secondary reason to keep the account open.

Tennis Betting in the United Kingdom – The Legal Frame

Tennis betting in Great Britain runs under the Gambling Act 2005, with the Gambling Commission licensing operators whose remote facilities are used by customers in England, Scotland and Wales. Northern Ireland sits outside the Act under its own older law, and a “GB licence” regulates Great Britain and nothing else. Since the Gambling (Licensing and Advertising) Act 2014, an operator needs a Commission licence wherever it is based – a Curaçao, Maltese or Gibraltar licence is not a substitute. The Commission’s public register is the whole test of who holds one, and any reader can search by business name, trading name, domain or account number.

Minimum age is 18. Identity verification – name, address and date of birth – is required before a customer can deposit or gamble, including with a free bet or bonus. There is no anonymous play at a UK-licensed operator, and source-of-funds questions at higher spend are normal under the money-laundering rules. Credit cards are banned for gambling in Great Britain, including credit-card-funded e-wallet payments; debit cards and bank-based payments are not covered by that ban. The punter cannot fund a betting account with a credit card at any licensed operator.

The bonus rules in force since 19 January 2026 cap wagering requirements on bonuses at 10x, ban mixed-product promotions across betting and casino, and sit alongside the existing marketing conditions under the LCCP. The advertising rules run through the CAP Code and BCAP Code, enforced by the ASA, and since 1 August 2019 betting advertisements are not shown on TV from five minutes before a live sporting event to five minutes after it, before the 9pm watershed, with horse and greyhound racing excluded. The Premier League clubs’ withdrawal of gambling sponsorship from the front of matchday shirts from the 2026/27 season is voluntary, not law, and the rule change concerns the shirt, not the bet.

The punter pays no tax on betting winnings in Great Britain – general information, not tax advice, and a professional gambler should ask HMRC or an adviser. General Betting Duty is the operator’s tax on gross profits, currently 15% across the board, with a new remote betting rate of 25% applying from 1 April 2027 alongside the existing 15% rate for remote bets on UK horse racing, pool betting and in-person betting. Until 1 April 2027 the remote rate stays at 15%, and whether operators pass duty on through odds is not established – never write that the player is charged duty.

Offshore operators without a GB licence cannot be evaluated by no-GAMSTOP-coverage or no-Commission-complaints-route as features, because they are simply outside the framework. A punter using an unlicensed site gives up the consumer protections the Act provides – no GAMSTOP, no ASA jurisdiction over marketing, no British dispute-resolution route, no 10x bonus cap, no vulnerability check at £150 of net deposits in a rolling 30 days – and accepts the risk of funds being withheld with no British redress. The honest framing: licensed means checks, limits, GAMSTOP, bonus cap, and verification before the first bet; unlicensed means none of those protections. Neither is “the safe choice” by default.

Responsible Gambling – Tools, Limits and Help

The first line of player protection at a UK-licensed bookmaker is identity verification and the affordability infrastructure underneath it. Since 7 May 2019 operators verify name, address and date of birth before a customer can deposit or gamble, and since 30 August 2024 a financial vulnerability check applies when a customer’s deposits minus withdrawals exceed £150 in a rolling 30 days (live since 28 February 2025). The check is a public-record check – bankruptcy or county court judgments – not an income check or a credit reference check. Financial risk assessments, the deeper “affordability checks” the press sometimes describes, are announced in a staged plan with no start date – write “announced, staged, no start date” rather than “in force”.

The second line is the customer’s own tools. Every licensed operator offers deposit limits on a fixed time frame – daily, weekly or monthly – with the first changes of the deposit-limit regime applied since 31 October 2025 and a second phase postponed to 30 September 2026. Time-outs, product restrictions and self-exclusion sit alongside. A punter who sets a deposit limit before their first bet keeps more control of the bankroll than one who tries to set it after a losing streak.

GAMSTOP is the national multi-operator online self-exclusion scheme and a mandatory licence condition for online operators since 31 March 2020. Self-exclusion periods are six months, one year, five years, or five years with auto-renewal. After the minimum period the exclusion stays in place for a further seven years unless the customer asks GAMSTOP to remove it. GAMSTOP covers online sites and apps; the betting shops use a separate service. The punter who signs up to GAMSTOP is excluded from every UK-licensed operator for the chosen period, and the exclusion cannot be lifted by customer service.

Help is available outside the operators. GamCare runs the National Gambling Helpline. GambleAware funds treatment and education. The NHS runs gambling clinics across England. Gamblers Anonymous runs peer-support meetings. The punter who feels their betting is running ahead of their bankroll – or running ahead of their intentions – reaches out to one of these services before reaching for another deposit.

Crypto, Bitcoin and Pseudonymous Tennis Betting

Tennis betting with bitcoin, ethereum or other cryptocurrencies sits in a small corner of the UK market. A British named-account rule, a state list of permitted payment methods and any rule for or against cryptocurrency deposits at licensed operators are not established – the question is settled by each operator’s own terms rather than by statute. What the law does establish is identity verification before the first deposit, and that requirement runs in money as much as in crypto: a punter depositing bitcoin at a licensed operator is still verified, still subject to GAMSTOP, still bound by the 10x bonus cap, and still inside the Commission’s complaints jurisdiction.

The punter using an unlicensed, crypto-only sportsbook sits outside the framework described in the legality section. No GAMSTOP coverage, no British dispute-resolution route, no bonus cap, no vulnerability check, and the operator holds the funds in a private wallet the punter cannot reach if the site stops paying out. The blockchain ledger is a public record of the deposit, but a public record of a deposit to a vanished operator is not a refund. Crypto gives the punter a fast, low-cost payment rail; it does not give the punter the protection the Gambling Act provides.

The honest framing for a reader comparing crypto betting to GBP betting: licensed crypto deposits at a UK-licensed operator carry the same protections as a debit-card deposit, because the protections attach to the licence rather than the payment method. Unlicensed crypto deposits carry the same risks as an unlicensed debit-card deposit, for the same reason.

Frequently Asked Questions

How do I bet on tennis?

Open an account at a UK-licensed bookmaker, deposit by debit card or bank transfer, find the tennis section, choose a market and add a selection to the slip. Stake a fixed percentage of your bankroll – 1-3 % is a typical band – and confirm the bet before the price moves. Identity verification runs before the first deposit at every brand on the public register.

How does tennis betting work?

A tennis bet is a contract at a price. If your selection wins, the bookmaker pays stake × decimal odds. The margin inside every price is the bookmaker’s cut, and it sits across every market. Match winner, set winner, total games, handicap and player performance are the standard markets; each carries its own margin.

What is a value bet, and why is no tip ever certain?

A value bet is a price above the true probability once the margin is removed. The punter’s own model says 58 %, the bookmaker says 53 %; the price is value. No tip is ever certain because the model is wrong as often as it is right, and a 1.20 favourite is one good return of serve from a loss. A tip is a story; a value bet is an edge the punter can measure.

What is the bookmaker’s margin and how can I see it in the odds?

The margin is the cut the book keeps from every market. On a two-way match at decimal odds 1.90 / 1.90, the implied probabilities sum to roughly 105 %, and the 5 percentage points above 100 are the margin. The margin is what makes the bookmaker a bookmaker, and it is the same number whether the match is a Slam final or a Challenger first round.

How is the return on a bet worked out from the stake and the odds?

Return is stake × decimal odds. Profit is stake × (decimal odds − 1). A £10 stake at 3.50 returns £35, of which £25 is profit. A combination bet multiplies the odds of its legs into one price, so a four-fold at legs of 1.50, 1.80, 1.65 and 1.40 carries combined odds of 6.237 and a £10 stake returns £62.37 if all four win.

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