This market refers to the tennis match between Isabella Maria Serban and Rebeka Masarova in the Tolentino, originally scheduled for September 23, 2026 at 4:00AM ET. This market will resolve to 'Isabella Maria Serban' if Isabella Maria Serban advances against Rebeka Masarova. This market will resolve to 'Rebeka Masarova' if Rebeka Masarova advances against Isabella Maria Serban. If the match is canceled (not played at all), ends in a tie, or a winner has not been determined by October 7, 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 WTA Tour. A consensus of credible reporting may also be used.