This market refers to the tennis match between Roman Safiullin and Petr Bar Biryukov in the Stuttgart Open, Qualification, originally scheduled for June 6, 2026 at 9:40AM ET. This market will resolve to 'Roman Safiullin' if Roman Safiullin advances against Petr Bar Biryukov. This market will resolve to 'Petr Bar Biryukov' if Petr Bar Biryukov advances against Roman Safiullin. 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 ATP Tour. A consensus of credible reporting may also be used.