Grand Slam Tennis turns publicly available match data into a model-driven price for every upcoming ATP and WTA match — singles and doubles. It’s free, runs entirely in your browser, and there’s no sign-up.
The data
Player serve and return ratings are built from the Match Charting Project — a large, open, point-by-point dataset of professional matches. Upcoming fixtures and draws are pulled from ESPN and tennis.com, and the whole site is rebuilt every few hours so prices stay current with the draw.
The ratings
Each player carries serve and return strength estimates by surface, because tennis form is surface-specific — a great clay-courter and a great grass-courter are not the same player. Those ratings feed a point-level model of how a given matchup is likely to play out.
From a matchup to a full book
For each fixture the model simulates the match point by point and aggregates the results into a complete set of prices: match winner, set betting, correct set score, total games, handicaps, tie-breaks, aces, double faults, breaks of serve and more. The Compare and Value pages put the model’s fair price next to the bookmakers’ to highlight where an edge might exist.
How accurate is it?
The Backtest page tracks the model against completed matches using log-loss and hit-rate, so you can judge it on its record rather than its claims. As with any model, it is an estimate — not a certainty, and not betting advice.
FAQ
Is the data real?
Yes. Ratings are derived from real charted professional matches, and fixtures reflect the live tour schedule.
Is it free?
Completely free, with no account or sign-up. If you’d like to help cover the running costs you can support it on Ko-fi.
Can I bet with these prices?
No. Everything here is for research and entertainment only. See the Terms of Use.
Grand Slam Tennis is unofficial and not affiliated with the ATP, WTA, ITF or any tournament. Part of the 0 Series alongside AFL 23-0, NRL 24-0, NBA 82-0, MLB 162-0, Football Invincibles and F1 Slam.