Mertens vs Chwalinska — Elise Mertens

Kalshi — primary rule

If Elise Mertens wins the Mertens vs Chwalinska professional tennis match in the 2026 WTA Singapore Quarterfinal after a ball has been played, then the market resolves to Yes.

Polymarket — resolution criteria

This market refers to the tennis match between Elise Mertens and Maja Chwalinska in the Singapore Open, originally scheduled for September 24, 2026 at 10:00PM ET. This market will resolve to 'Elise Mertens' if Elise Mertens advances against Maja Chwalinska. This market will resolve to 'Maja Chwalinska' if Maja Chwalinska advances against Elise Mertens. If the match is canceled (not played at all), ends in a tie, or a winner has not been determined by October 8, 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.