This market refers to the tennis match between Madison Keys and Qinwen Zheng in the US Open WTA, originally scheduled for September 4, 2026 at 11:00AM ET. This market will resolve to 'Madison Keys' if Madison Keys advances against Qinwen Zheng. This market will resolve to 'Qinwen Zheng' if Qinwen Zheng advances against Madison Keys. If the match is canceled (not played at all), ends in a tie, or a winner has not been determined by September 18, 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.