This market refers to the tennis match between Mirra Andreeva and Nikola Bartunkova in the US Open WTA, originally scheduled for September 5, 2026 at 11:00AM ET. This market will resolve to 'Mirra Andreeva' if Mirra Andreeva advances against Nikola Bartunkova. This market will resolve to 'Nikola Bartunkova' if Nikola Bartunkova advances against Mirra Andreeva. If the match is canceled (not played at all), ends in a tie, or a winner has not been determined by September 19, 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.