European Open: Mariano Navone vs Tallon Griekspoor

Kalshi — primary rule

If Mariano Navone wins the Navone vs Griekspoor professional tennis match in the 2026 ATP Brussels 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 Mariano Navone and Tallon Griekspoor in the European Open, originally scheduled for October 21, 2026 at 7:00AM ET. This market will resolve to 'Mariano Navone' if Mariano Navone advances against Tallon Griekspoor. This market will resolve to 'Tallon Griekspoor' if Tallon Griekspoor advances against Mariano Navone. If the match is canceled (not played at all), ends in a tie, or a winner has not been determined by November 4, 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.