TOTAL VOLUME:
$134.2b
24H VOL:
$130,522,377
24H TRANSACTIONS:
2,388,728,490
OPEN INTEREST:
$1,438,389,636
404,028
Markets across
30,214
events
MATCHED EVENTS:
2,681
PLATFORM COVERAGE:
5
Polymarket:
39%
VS.
Kalshi:
61%
Closed: Aug 18, 4:50 PM EST
Kalshi
Marta Kostyuk and Sloane Stephens will engage in a professional tennis match during the 2026 WTA Cincinnati Round Of 32. The winner of the match after play commences determines the outcome.
If Marta Kostyuk wins the Kostyuk vs Stephens professional tennis match in the 2026 WTA Cincinnati Round Of 32 after a ball has been played, then the market resolves to Yes. If Sloane Stephens wins the Kostyuk vs Stephens professional tennis match in the 2026 WTA Cincinnati Round Of 32 after a ball has been played, then the market resolves to Yes.