Set 1 Winner: Yastremska vs Sierra

Prediction market on polymarket. This market refers to the tennis match between Dayana Yastremska and Solana Sierra in the Madrid Open, originally scheduled for April 21, 2026 at 5:00AM ET. This market will resolve to “Yastremska” if Dayana Yastremska wins the first set. It will resolve to “Sierra” if Solana Sierra 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.

Liquidity: $2,347.078. Resolves: 4/28/2026.