This market refers to the tennis match between Sammy Guinau and Alexander Maarten Sander Jong in the ITF Men Alkmaar, originally scheduled for June 23, 2026 at 1:00PM ET. This market will resolve to 'Sammy Guinau' if Sammy Guinau advances against Alexander Maarten Sander Jong. This market will resolve to 'Alexander Maarten Sander Jong' if Alexander Maarten Sander Jong advances against Sammy Guinau. 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 International Tennis Federation (ITF). A consensus of credible reporting may also be used.