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This market refers to the tennis match between Rei Sakamoto and Vilius Gaubas in the Madrid Open, Qualification, originally scheduled for April 21, 2026 at 5:00AM ET. This market will resolve to 'Rei Sakamoto' if Rei Sakamoto advances against Vilius Gaubas. This market will resolve to 'Vilius Gaubas' if Vilius Gaubas advances against Rei Sakamoto. 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 ATP Tour. A consensus of credible reporting may also be used.