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This market refers to the tennis match between Elvina Kalieva and Katerina Siniakova in the Madrid Open, originally scheduled for April 22, 2026 at 11:30AM ET. This market will resolve to 'Elvina Kalieva' if Elvina Kalieva advances against Katerina Siniakova. This market will resolve to 'Katerina Siniakova' if Katerina Siniakova advances against Elvina Kalieva. 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.