This market refers to the doubles tennis match between Siniakova/Townsend and Mertens/Shnaider in the US Open WTA, originally scheduled for September 9, 2026 at 11:00AM ET. This market will resolve to 'Siniakova/Townsend' if the team of Siniakova/Townsend advances against Mertens/Shnaider. This market will resolve to 'Mertens/Shnaider' if the team of Mertens/Shnaider advances against Siniakova/Townsend. If the match is canceled (not played at all), ends in a tie, or a winner has not been determined by September 23, 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 team advances due to the opponent's retirement, default, or disqualification, this market will resolve to the team who advances. If the match ends in a walkover (a team 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.