This market refers to the tennis match between Calvin Mueller and Daniel Masur in the ITF M25 Ueberlingen Men, originally scheduled for August 18, 2026 at 2:00PM ET. This market will resolve to 'Calvin Mueller' if Calvin Mueller advances against Daniel Masur. This market will resolve to 'Daniel Masur' if Daniel Masur advances against Calvin Mueller. 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 International Tennis Federation (ITF). A consensus of credible reporting may also be used.