This market refers to the tennis match between Andrea Guerrieri and Abedallah Shelbayh in the Olbia, originally scheduled for October 12, 2026 at 8:00AM ET. This market will resolve to 'Andrea Guerrieri' if Andrea Guerrieri advances against Abedallah Shelbayh. This market will resolve to 'Abedallah Shelbayh' if Abedallah Shelbayh advances against Andrea Guerrieri. If the match is canceled (not played at all), ends in a tie, or a winner has not been determined by October 26, 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.