TOTAL VOLUME:
$134b
24H VOL:
$107,351,958
24H TRANSACTIONS:
2,388,728,490
OPEN INTEREST:
$1,416,970,024
400,720
Markets across
30,097
events
MATCHED EVENTS:
2,633
PLATFORM COVERAGE:
5
Polymarket:
39%
VS.
Kalshi:
61%
Closed: Sep 2, 3:13 PM EST
Kalshi
Marta Kostyuk and Sloane Stephens compete in the 2026 US Open Women Singles Round Of 64, and spectators wager on whether their match will surpass set game totals.
Resolution depends on whether the Marta Kostyuk vs Sloane Stephens match completes more than 15.5, 20.5, or 25.5 games. Cancellations before any play result in fair pricing. Postponed matches remain active for up to two weeks after rescheduling. If a player retires, settled markets resolve based on completed games; others resolve to Fair Market Price at the Exchange's discretion.