Osaka vs Rybakina — Naomi Osaka

Kalshi — primary rule

If Naomi Osaka wins the Osaka vs Rybakina professional tennis match in the 2026 US Open Women Singles 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 Naomi Osaka and Elena Rybakina in the US Open WTA, originally scheduled for September 7, 2026 at 11:00AM ET. This market will resolve to 'Naomi Osaka' if Naomi Osaka advances against Elena Rybakina. This market will resolve to 'Elena Rybakina' if Elena Rybakina advances against Naomi Osaka. If the match is canceled (not played at all), ends in a tie, or a winner has not been determined by September 21, 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.