This market refers to the tennis match between Elias Ymer and Luca Castelnuovo in the Guangzhou, originally scheduled for September 16, 2026 at 4:00AM ET. This market will resolve to 'Elias Ymer' if Elias Ymer advances against Luca Castelnuovo. This market will resolve to 'Luca Castelnuovo' if Luca Castelnuovo advances against Elias Ymer. If the match is canceled (not played at all), ends in a tie, or a winner has not been determined by September 30, 2026, 11:59 PM ET (14 days after the scheduled start), 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.