This market refers to the tennis match between Mayar Sherif and Oleksandra Oliynykova in the Monterrey Open, originally scheduled for August 23, 2026 at 11:00PM ET. This market will resolve to 'Mayar Sherif' if Mayar Sherif advances against Oleksandra Oliynykova. This market will resolve to 'Oleksandra Oliynykova' if Oleksandra Oliynykova advances against Mayar Sherif. If the match is canceled (not played at all), ends in a tie, or a winner has not been determined by September 6, 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.