Tiafoe vs Michelsen — Frances Tiafoe

Kalshi — primary rule

If Frances Tiafoe wins the Tiafoe vs Michelsen professional tennis match in the 2026 US Open Men Singles Quarterfinal after a ball has been played, then the market resolves to Yes.

Polymarket — resolution criteria

This market refers to the tennis match between Frances Tiafoe and Alex Michelsen in the US Open ATP, originally scheduled for September 8, 2026 at 11:30AM ET. This market will resolve to 'Frances Tiafoe' if Frances Tiafoe advances against Alex Michelsen. This market will resolve to 'Alex Michelsen' if Alex Michelsen advances against Frances Tiafoe. If the match is canceled (not played at all), ends in a tie, or a winner has not been determined by September 22, 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.