Yastremska vs. Sierra: Set 1 Games O/U 9.5

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 "Over" if the total number of games completed in the first set equals or exceeds 10. Otherwise, it will resolve to "Under." Any first-set tiebreak counts as one (1) game toward the total. If the first set is not completed for any reason, this market will resolve 50-50. If the match is canceled before play begins, or delayed beyond 7 days without commencement, this market will also resolve 50-50. Resolution will be based on official WTA results.

Liquidity: $206.94. Resolves: 4/28/2026.