Set 1 Winner: Rybakina vs Kostyuk

This market refers to the tennis match between Elena Rybakina and Marta Kostyuk in the Miami Open, scheduled for March 21 2026. This market will resolve to “Rybakina” if Elena Rybakina wins the first set. It will resolve to “Kostyuk” if Marta Kostyuk wins the first set. If the match begins but is not completed, and the first set is concluded with a winner determined, this market will resolve based on that completed set. If the first set is not completed for any reason, this market will resolve 50-50. If the match is canceled (not played at all) or is delayed beyond 7 days from the scheduled date without play beginning, this market will resolve 50-50. Resolution will be based on official WTA match statistics.