This market refers to the tennis match between Gonzalo Villanueva and Guido Justo in the Buenos Aires 2, originally scheduled for September 21, 2026 at 9:00AM ET. This market will resolve to 'Gonzalo Villanueva' if Gonzalo Villanueva advances against Guido Justo. This market will resolve to 'Guido Justo' if Guido Justo advances against Gonzalo Villanueva. If the match is canceled (not played at all), ends in a tie, or a winner has not been determined by October 5, 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.