This market refers to the tennis match between Tatiana Prozorova and Sofia Costoulas in the Singapore Open, originally scheduled for September 20, 2026 at 10:00PM ET. This market will resolve to 'Tatiana Prozorova' if Tatiana Prozorova advances against Sofia Costoulas. This market will resolve to 'Sofia Costoulas' if Sofia Costoulas advances against Tatiana Prozorova. If the match is canceled (not played at all), ends in a tie, or a winner has not been determined by October 4, 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.