Cincinnati Open: Marta Kostyuk vs Sloane Stephens
- Marta Kostyuk vs. Sloane Stephens: Total Sets O/U 2.528¢
- Kostyuk vs. Stephens: Set 2 Games O/U 9.550¢
- Set 1 Winner: Kostyuk vs Stephens79¢
- Kostyuk vs. Stephens: Match O/U 23.532¢
- Kostyuk vs. Stephens: Match O/U 21.536¢
- Set Handicap: Kostyuk (-1.5) vs Stephens (+1.5)67¢
- Kostyuk vs. Stephens: Set 1 Games O/U 8.559¢
- Cincinnati Open: Marta Kostyuk vs Sloane Stephens87¢
- Cincinnati Open: Completed Match: Marta Kostyuk vs Sloane Stephens50¢
- Kostyuk vs. Stephens: Set 2 Games O/U 8.550¢
- Kostyuk vs. Stephens: Match O/U 22.533¢
- Kostyuk vs. Stephens: Set 1 Games O/U 10.519¢
This market refers to the tennis match between Marta Kostyuk and Sloane Stephens in the Cincinnati Open, originally scheduled for August 18, 2026 at 10:00AM ET. This market will resolve to 'Marta Kostyuk' if Marta Kostyuk advances against Sloane Stephens. This market will resolve to 'Sloane Stephens' if Sloane Stephens advances against Marta Kostyuk. If the match is canceled (not played at all), ends in a tie, or is delayed beyond 7 days from the scheduled date without a winner determined, this market will resolve to 50-50. If the match begins but is not completed, and one player advances due to the opponent's retirement, default, or disqualification, this market will resolve to the player who advances. If the match ends in a walkover (player withdraws before the start and the other advances automatically), this market will resolve to 50-50. The primary resolution source will be official information from the WTA Tour. A consensus of credible reporting may also be used.
Marta Kostyuk enters the Cincinnati Open third round as the clear favorite against Sloane Stephens, backed by her No. 11 ranking, strong 2026 hard-court form (roughly 30-7 overall), and recent straight-sets win over Sofia Kenin. The Ukrainian has compiled consistent results across WTA 1000 events this season, including deep runs that reflect reliable baseline power and movement on outdoor hard courts. Stephens, a former US Open champion granted a wildcard, sits well outside the top 200 with a 13-15 record and has relied on experience to notch wins over Sinja Kraus and Anastasia Potapova. Their first career meeting favors the higher-ranked player’s current level, though Stephens’ veteran serve and court craft could extend sets if she maintains the momentum from her early Cincinnati victories.