This market refers to the tennis match between Marta Kostyuk and Sloane Stephens in the US Open WTA, originally scheduled for September 2, 2026 at 11:00AM 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 a winner has not been determined by September 16, 2026, 11:59 PM ET (14 days after the scheduled start), 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.
US Open WTA: Marta Kostyuk vs Sloane Stephens
Sloane Stephens15
Marta Kostyuk67Game context
Marta Kostyuk enters this US Open second-round matchup as the clear favorite, holding the No. 11 ranking and riding a strong 2026 campaign that includes a Madrid title, French Open and Wimbledon semifinals, and consistent hard-court results. She defeated Stephens 7-5, 7-5 in their only prior meeting during the Cincinnati third round on the same surface. Sloane Stephens, the 2017 US Open champion and wildcard entrant ranked No. 209, has shown signs of resurgence with back-to-back Cincinnati wins and a straight-sets first-round victory over Clara Tauson—her first Grand Slam match win in two years—while benefiting from home-crowd energy on Louis Armstrong Stadium. The American’s defensive style and experience could extend rallies, though Kostyuk’s superior recent form and head-to-head edge shape the prevailing trader consensus on the outcome.
