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Tennis Betting Glossary: 50+ Terms in Plain English

Every term you'll see in tennis betting — from break-point markets to closing-line value — explained without jargon. Bookmark this page; it's the cheat-sheet for everything else.

Markets & Bet Types

• Match winner (moneyline / 2-way) — outright pick of who wins the match. Most basic tennis bet.
• Set winner — pick winner of a specific set. Higher variance than match winner.
• Set betting (correct sets) — exact set score (e.g., 2-0, 2-1). Higher payouts, lower hit rate.
• Total games over/under — total games played in the match crosses a line (e.g., over 22.5).
• Total sets over/under — for best-of-5, will it go to 4 or 5 sets?
• Game handicap — one player gets a virtual head-start in games (e.g., -3.5 games).
• Set handicap — most often -1.5 sets for the favourite (must win in straights).
• First-set winner — pick winner of set 1 only. Useful for fast-starter players.
• Tiebreak yes/no — will any set go to a tiebreak.
• To win without dropping a set — same as set handicap -1.5 for best-of-3.
• Live (in-play) betting — markets remain open during play with prices updating ball-by-ball.
• Outright winner — pre-tournament bet on overall champion.

Pricing & Value Concepts

• Decimal odds — total return per 1 unit staked. 2.00 = even money. Convert here.
• American odds — +150 means win $150 on $100 stake; -200 means stake $200 to win $100.
• Fractional odds — UK style (e.g., 6/4 = 2.50 decimal).
• Implied probability — odds converted to a probability (1 / decimal_odds).
• Vig (juice / overround) — bookmaker's margin built into the prices. A 100% market would have no vig.
• Expected Value (EV) — long-run profit per unit if your true win probability beats the implied probability of the price. Calculator.
• +EV pick — a bet where your model's probability is higher than the bookmaker's implied probability.
• Closing Line Value (CLV) — the difference between the price you took and the closing line. Positive CLV is the gold-standard signal of edge. Deep dive.
• Sharp price — the line offered by markets that take big bets and don't restrict winners (e.g., Pinnacle).
• Soft line — recreational-book price that reacts slowly to sharp money — often where +EV opportunities live.
• No-vig fair line — the implied probability with the bookmaker's margin removed.
• Steam move — a sudden line move triggered by sharp money hitting all books.

Stake Sizing & Bankroll

• Bankroll — total capital allocated to betting. Should be money you can fully lose.
• Unit — typically 1% of bankroll. Standardises stake sizes across different bankroll sizes.
• Flat staking — the same stake on every pick regardless of confidence.
• Kelly Criterion — optimal stake formula given edge and odds. Full guide. Calculator.
• Fractional Kelly — staking a fraction of full Kelly (e.g., 0.25 Kelly) to reduce variance.
• ROI — return on investment, profit divided by total amount staked. Tracker.
• Yield — same concept as ROI in tipster speak.
• Drawdown — peak-to-trough decline in bankroll. All edges experience drawdowns; size matters.
• Variance — short-run swings around expected outcome. Even +EV bets lose often. Manage variance.

Tennis-Specific Concepts

• Best-of-3 / Best-of-5 — match format. ATP Slams + Davis Cup are best-of-5; everything else is best-of-3.
• Tiebreak — first to 7 points (win by 2) decides a set tied at 6-6. Final sets vary by tournament.
• Break of serve — winning a game when the opponent was serving. Highly correlated with set outcome.
• Hold of serve — winning your own service game.
• Surface — hard, clay, grass, indoor. Each has different ball speed, bounce and player suitability. Deep dive.
• Elo rating — head-to-head skill rating updated after every match. Surface-aware Elo is the standard for tennis modelling.
• ATP / WTA ranking — points-based ranking. Useful for tier classification but worse than Elo for predictions.
• Walkover (W/O) — opponent withdraws before play. Bets typically void.
• Retirement (RET) — player retires mid-match. Bet rules vary by book — most settle on completed sets.
• Draw — the bracket of seeded and unseeded players for a tournament.
• Lucky loser — a player who lost in qualifying but enters the main draw due to a withdrawal.
• Wildcard — direct entry granted by the tournament; usually a returning star or local prospect.

Modelling & Tipster Vocabulary

• Hit rate — % of bets that win. Vanity metric without ROI context.
• Confidence score — model output expressed 0-100. TIPERO uses calibrated logistic regression so 70 means roughly 70% true probability.
• Calibration — does the model's claimed probability match the actual win rate at that probability bucket? Crucial — uncalibrated models lie.
• Backtest — historical simulation of a strategy on past data.
• Out-of-sample test — testing on data the model didn't train on. The only honest test.
• Survivorship bias — leaderboards only show winners; vanished tipsters are invisible. Hugely inflates apparent industry edge.
• Tier — TIPERO's CORE / VALUE / LONG / ULTRA classification by odds range and edge size.
• EV filter — selecting only picks with positive expected value at the best available price.
• XGBoost — a gradient-boosting tree model TIPERO uses as a head feature.
• Self-learning model — retrains automatically on graded outcomes; learns from drift.
• Shadow mode — running a new model in parallel without staking real money, comparing to live model output.

Bookmaker & Market Vocabulary

• Recreational book — sportsbook serving casual punters; soft prices, restrictive of winners.
• Sharp book — high-limit book that welcomes winners and adjusts lines based on sharp action (Pinnacle, Matchbook, Smarkets).
• Exchange — peer-to-peer betting marketplace where you can lay (bet against) outcomes (Betfair, Smarkets).
• Lay bet — betting against an outcome on an exchange.
• Cash out — taking a settlement before the event finishes; book retains a margin.
• Bonus / boost — promotional pricing to attract bets. Typically with rollover requirements.
• Stake limit / restriction — bookmakers cap or refuse stakes from winning customers; sharp books don't.

Frequently asked questions

Related guides

• Closing-line value (CLV) explained
• Kelly criterion for tennis bettors
• Reading tennis odds movements
• All TIPERO vs comparison pages

Last updated: 2026-05-07 · Live stats from track record.