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This market refers to the tennis match between Katerina Siniakova and Caty McNally in the Madrid Open, originally scheduled for April 26, 2026 at 5:00AM ET. This market will resolve to 'Katerina Siniakova' if Katerina Siniakova advances against Caty McNally. This market will resolve to 'Caty McNally' if Caty McNally advances against Katerina Siniakova. If the match is canceled (not played at all), ends in a tie, or is delayed beyond 7 days from the scheduled date without a winner determined, 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.