Tennis Moneylines

ATP and Challenger use an experimental Elo-based model. Its recorded historical improvement over overall Elo is small, and it has not established a reliable betting advantage. Use forecast results to inspect the size and quality of the saved live sample.

Probabilities estimate the winner of a completed match using overall and surface ratings. Fair lines exclude bookmaker margin. The difference is measured against DraftKings probabilities with the margin removed. Because the two win probabilities add to 100%, fair American lines are equal and opposite: 71.4% / 28.6% is approximately −250 / +250. Missing prices mean we have no verified pair from our odds feed; a match may still be listed at DraftKings. Retirements and walkovers are excluded from model evaluation.