Polymarket trading on Cincinnati Open matches from August 18–20, 2026 tracked odds for four matches. Iga Swiatek showed 100% win probability against Elena Rybakina on August 20, while other matches showed more competitive odds.
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Nuno Borges: 42%; Completed Match: 50%; Cincinnati Open: Nuno Borges vs Brandon Nakashima Set 2 Winner: 100%; Cincinnati Open: Nuno Borges vs Brandon Nakashima Total Sets: O/U 2.5: 50%. 24h volume $602,991.
Amanda Anisimova: 78%; Completed Match: 50%; Cincinnati Open: Amanda Anisimova vs Jessica Pegula Match O/U 21.5: 97%; Cincinnati Open: Amanda Anisimova vs Jessica Pegula Set 2 Winner: 97%. 24h volume $930,858.
Iga Swiatek: 100%; Completed Match: 0%; Cincinnati Open: Iga Swiatek vs Elena Rybakina Total Sets: O/U 2.5: 50%; Cincinnati Open: Iga Swiatek vs Elena Rybakina Match O/U 21.5: 50%. 24h volume $5,300,661.
Sara Bejlek: 22%; Completed Match: 50%; Cincinnati Open: Sara Bejlek vs Madison Keys Total Sets: O/U 2.5: 55%; Cincinnati Open: Sara Bejlek vs Madison Keys Set 2 O/U 8.5: 50%. 24h volume $685,853.