Tennis bets today: 10 picks for Tuesday ft. Kostyuk vs. Stephens [8/18/2026]

WTA Cincinnati Open: Sloane Stephens vs. Marta Kostyuk Over 18.5 total games (-120)

• Edge: 7.6%
• Probability: 62.2%
• Matchup: Marta Kostyuk vs. Sloane Stephens (3:00PM ET)

Our model has identified value on Over 18.5 total games in Sloane Stephens vs. Marta Kostyuk at -120 odds in their matchup at WTA Cincinnati Open. A 62.2% probability produces an edge of 7.6%, making this the strongest play for today's tennis slate.

WTA Cincinnati Open: Ann Li +5.5 games (-108)

• Edge: 7.6%
• Probability: 59.5%
• Matchup: Coco Gauff vs. Ann Li (3:00PM ET)

At WTA Cincinnati Open, Ann Li +5.5 games carries a 7.6% edge and a probability of 59.5% at -108 odds, according to our model.

ATP Cincinnati Open: Joao Fonseca -4.5 (+110)

• Edge: 6.8%
• Probability: 54.4%
• Matchup: Joao Fonseca vs. Christopher O'Connell (11:00AM ET)

Joao Fonseca -4.5 vs. Christopher O'Connell at +110 odds shows a 6.8% edge, supported by a 54.4% probability in simulations of the ATP Cincinnati Open match.

WTA Cincinnati Open: Sloane Stephens +6.5 (-140)

• Edge: 5.8%
• Probability: 64.1%
• Matchup: Marta Kostyuk vs. Sloane Stephens (3:00PM ET)

A 5.8% edge and 64.1% probability makes Sloane Stephens +6.5 vs. Marta Kostyuk a value play in the Marta Kostyuk vs. Sloane Stephens matchup, per our model.

ATP Cincinnati Open: Nuno Borges ML (+165)

• Edge: 4.9%
• Probability: 42.7%
• Matchup: Andrey Rublev vs. Nuno Borges (11:00AM ET)

Nuno Borges ML at +165 odds presents a 4.9% edge, with simulations resulting in a probability of 42.7%.

ATP Cincinnati Open: Taylor Fritz -4.5 (+106)

• Edge: 4.3%
• Probability: 52.8%
• Matchup: Taylor Fritz vs. Daniel Merida (12:30PM ET)

Our model finds value on Taylor Fritz -4.5 at +106 odds at ATP Brisbane, supported by an edge of 4.3%.

WTA Cincinnati Open: Marie Bouzkova ML (+155)

• Edge: 3.9%
• Probability: 43.1%
• Matchup: Marie Bouzkova vs. Iva Jovic (8:30PM ET)

Our model has uncovered value on Iva Jovic-Marie Bouzkova to finish as a tie after 90 minutes at +155 odds. A 43.1% probability produces a 3.9% edge, making this a strong play for today's WTA Cincinnati Open tennis action.

ATP Cincinnati Open: Christopher O'Connell vs. Joao Fonseca Under 22.5 total games (-128)

• Edge: 3.7%
• Probability: 59.8%
• Matchup: Joao Fonseca vs. Christopher O'Connell (11:00AM ET)

A 3.7% edge on a 59.8% probability makes Under 22.5 total games at -128 odds a solid value play in this ATP Cincinnati Open matchup.

ATP Cincinnati Open: Frances Tiafoe ML (+115)

• Edge: 3.2%
• Probability: 49.7%
• Matchup: Learner Tien vs. Frances Tiafoe (8:10PM ET)

Our model projects value on Frances Tiafoe to win at +115 odds. A 49.7% probability produces a 3.2% edge, making Frances Tiafoe the favorable ML play in today's ATP Cincinnati Open matchup.

WTA Cincinnati Open: Xinyu Wang vs. Aryna Sabalenka Over 18.5 total games (-124)

• Edge: 2.9%
• Probability: 58.3%
• Matchup: Aryna Sabalenka vs. Xinyu Wang (7:00PM ET)

Rounding out our top 10 bets, Aryna Sabalenka vs. Xinyu Wang Over 18.5 total games at -124 odds shows a 58.3% probability and a 2.9% edge.

Tennis best bets summary: Tuesday, 8/18/2026

As of 4:35AM ET, here are our top tennis bets by edge recommended by our model:

List of upcoming tennis matches to bet on now

• WTA Cincinnati: Madison Keys vs. Katerina Siniakova (11:00AM ET, Tuesday)
• ATP Cincinnati: Nuno Borges vs. Andrey Rublev (11:00AM ET, Tuesday)
• ATP Cincinnati: Christopher O'Connell vs. Joao Fonseca (11:00AM ET, Tuesday)
• WTA Cincinnati: Mirra Andreeva vs. Janice Tjen (12:10PM ET, Tuesday)
• ATP Cincinnati: Lorenzo Musetti vs. Michael Zheng (12:10PM ET, Tuesday)
• ATP Cincinnati: Daniel Merida vs. Taylor Fritz (12:30PM ET, Tuesday)
• WTA Cincinnati: Elina Svitolina vs. Xiyu Wang (2:00PM ET, Tuesday)
• ATP Cincinnati: Daniil Medvedev vs. Brandon Nakashima (2:30PM ET, Tuesday)
• WTA Cincinnati: Ann Li vs. Coco Gauff (3:00PM ET, Tuesday)
• WTA Cincinnati: Sloane Stephens vs. Marta Kostyuk (3:00PM ET, Tuesday)

Conclusion

Our tennis best bets are locked and loaded for August 18, 2026, featuring plays such as over 18.5 total games in the Marta Kostyuk vs. Coco Gauff matchup and Ann Li +5.5 games. Powered by advanced simulations, these picks are here to boost your betting game.

Our predictions are grounded in current data to help you make informed decisions. For additional resources and advice, head to our Responsible Gambling hub.

All odds and probabilities in this article are correct and accurate at the time of publication.