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This market refers to the tennis match between Stefanos Tsitsipas and Daniel Merida Aguilar in the Madrid Open, originally scheduled for April 27, 2026 at 5:00AM ET. This market will resolve to 'Stefanos Tsitsipas' if Stefanos Tsitsipas advances against Daniel Merida Aguilar. This market will resolve to 'Daniel Merida Aguilar' if Daniel Merida Aguilar advances against Stefanos Tsitsipas. 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.