This market refers to the tennis match between Karen Khachanov and Alexander Blockx in the US Open ATP, originally scheduled for September 9, 2026 at 11:30AM ET. This market will resolve to “Khachanov” if Karen Khachanov wins the first set. It will resolve to “Blockx” if Alexander Blockx wins the first set. If the match begins but is not completed, and the first set is concluded with a winner determined, this market will resolve based on that completed set. If the first set is not completed for any reason, this market will resolve 50-50. If the match is canceled (not played at all) or play has not begun by September 23, 2026, 11:59 PM ET (14 days after the scheduled start), this market will resolve 50-50. Resolution will be based on official Grand Slam match statistics.