This market refers to the tennis match between Goncalo Marques and Sergio Callejon Hernando in the ITF M25 Idanha-a-Nova Men, originally scheduled for August 11, 2026 at 4:30AM ET. This market will resolve to 'Goncalo Marques' if Goncalo Marques advances against Sergio Callejon Hernando. This market will resolve to 'Sergio Callejon Hernando' if Sergio Callejon Hernando advances against Goncalo Marques. 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.