US Open ATP: Alexander Zverev vs Botic van de Zandschulp

Kalshi — primary rule

If Alexander Zverev wins the Zverev vs Van de Zandschulp 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 Alexander Zverev and Botic van de Zandschulp in the US Open ATP, originally scheduled for September 9, 2026 at 11:30AM ET. This market will resolve to 'Alexander Zverev' if Alexander Zverev advances against Botic van de Zandschulp. This market will resolve to 'Botic van de Zandschulp' if Botic van de Zandschulp advances against Alexander Zverev. If the match is canceled (not played at all), ends in a tie, or a winner has not been determined by September 23, 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.