Gauff vs Mertens — Coco Gauff

Kalshi — primary rule

If Coco Gauff wins the Gauff vs Mertens professional tennis match in the 2026 WTA Beijing Round Of 16 after a ball has been played, then the market resolves to Yes.

Polymarket — resolution criteria

This market refers to the tennis match between Coco Gauff and Elise Mertens in the China Open, originally scheduled for October 6, 2026 at 11:00PM ET. This market will resolve to 'Coco Gauff' if Coco Gauff advances against Elise Mertens. This market will resolve to 'Elise Mertens' if Elise Mertens advances against Coco Gauff. If the match is canceled (not played at all), ends in a tie, or a winner has not been determined by October 20, 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 WTA Tour. A consensus of credible reporting may also be used.