TOTAL VOLUME:
$134.2b
24H VOL:
$126,324,530
24H TRANSACTIONS:
2,388,728,490
OPEN INTEREST:
$1,434,646,834
406,019
Markets across
30,401
events
MATCHED EVENTS:
2,689
PLATFORM COVERAGE:
5
Polymarket:
39%
VS.
Kalshi:
61%
Closed: Sep 2, 2:24 PM EST
Kalshi
The same match features Kostyuk and Stephens battling again, this time with the focus on the first set. The result hinges on which player secures the win in that initial segment of their encounter.
If Marta Kostyuk wins set 1 in the Marta Kostyuk vs Sloane Stephens professional tennis match in the 2026 US Open Women Singles Round Of 64, then the market resolves to Yes. If Sloane Stephens wins set 1 in the Marta Kostyuk vs Sloane Stephens professional tennis match in the 2026 US Open Women Singles Round Of 64, then the market resolves to Yes.