KalshiClosedCheck availabilityKYC required2% feeVerified resolution dataFairly calibratedThis market resolved: Marta Kostyuk (99%)
Resolved: Sep 2, 2026, 7:12 PM
Provider-verified resolution
CoinRithm has provider-backed winner and settlement-time evidence for this market.
Current implied probability
Marta Kostyuk 99%+10.0pt
Market quality
≤49 / 100
Low quality24h Volume
$2.2M
Liquidity
$1.4M
High liquidityBid / Ask
- / 100.0%
Market data
Updated 3 hours ago
StaleAug 31, 26, 10:46 PMSep 2, 26, 7:10 PM
Probability Timeline
Marta Kostyuk99%
Sloane Stephens1%
99%
1%
Rules
If the named outcome wins the Kostyuk vs Stephens professional tennis match in the 2026 US Open Women Singles Round Of 64 after a ball has been played, then the market resolves to Yes.
Settles via:WTA
- The following market refers to the Kostyuk vs Stephens professional tennis match in the 2026 US Open Women Singles Round Of 64 after a ball has been played.
- If the match does not occur (signaled by a ball being played) due to a player injury, walkover, forfeiture, or any other cancellation (all before the match starts), the market will resolve to a fair price in accordance with the rules.
- If this match is postponed or delayed, the market will remain open and close after the rescheduled match has finished (within two weeks).
- Kalshi is not affiliated, associated, authorized, endorsed by, or in any way officially connected with the Governing League.
- All trademarks, logos, and brand names are the property of their respective owners.
Open markets
SportsKALSHIGiron vs Buse
- Ignacio Buse+29.0pt89.1%
- Marcos Giron-28.0pt10.9%
- Total Vol
- $8.9M
- 24h Vol
- $8.3M
KALSHIBaltimore vs Colorado
- Baltimore+17.0pt76%
- Colorado-18.0pt24%
- Total Vol
- $4.8M
- 24h Vol
- $4.2M
KALSHIDe Jong vs Passaro
- Jesper De Jong+7.0pt61.8%
- Francesco Passaro-6.0pt38.2%
- Total Vol
- $3.4M
- 24h Vol
- $2.7M
KALSHISeattle vs Boston
- Seattle+53.0pt98%
- Boston-55.0pt2%
- Total Vol
- $2.7M
- 24h Vol
- $2.6M
KALSHIToronto vs Cleveland
- Toronto+2.0pt55.5%
- Cleveland-2.0pt44.5%
- Total Vol
- $2.4M
- 24h Vol
- $2.4M
KALSHIBergs vs Taberner
- Zizou Bergs+8.0pt94%
- Carlos Taberner-9.0pt6%
- Total Vol
- $3.5M
- 24h Vol
- $2.2M
- Etcheverry vs Fearnley
- US Open Men's Singles Winner
- Shapovalov vs Van Assche
- Maria vs Ostapenko
- US Open ATP: Marcos Giron vs Ignacio Buse
- Jovic vs Frech
- Baltimore vs Colorado: Total Runs
- Baltimore Orioles vs. Colorado Rockies
- 2026 Men’s US Open Winner (Tennis)
- MLB: Atlanta Braves vs Washington Nationals (Sep 2, 2026)
- UEFA Champions League: 2027 Champion
- Omega European Masters Winner
Frequently asked questions
- What are the current odds for Kostyuk vs Stephens?
- Kalshi prices Marta Kostyuk at 99% as of September 2, 2026.
- When does Kostyuk vs Stephens resolve?
- Kostyuk vs Stephens is scheduled to resolve on September 2, 2026.
- How is Kostyuk vs Stephens settled?
- Kalshi settles this market as follows: If the named outcome wins the Kostyuk vs Stephens professional tennis match in the 2026 US Open Women Singles Round Of 64 after a ball has been played, then the market resolves to Yes.