The market strongly favors US Open WTA: Marta Kostyuk vs Sloane Stephens at 86%. High confidence — but lower potential returns.
| # | Outcome | Probability | If Right | Volume |
|---|---|---|---|---|
| 1 | US Open WTA: Marta Kostyuk vs Sloane Stephens | 86% | +16% | $13K |
| 2 | US Open WTA: Marta Kostyuk vs Sloane Stephens Set 2 Winner | 80% | +25% | - |
| 3 | US Open WTA: Marta Kostyuk vs Sloane Stephens Set 1 Winner | 78% | +27% | - |
| 4 | US Open WTA: Marta Kostyuk vs Sloane Stephens Set Handicap +/-1.5 | 66% | +52% | - |
| 5 | US Open WTA: Marta Kostyuk vs Sloane Stephens Set 1 O/U 8.5 | 58% | +72% | - |
| 6 | US Open WTA: Marta Kostyuk vs Sloane Stephens Game Spread +/-5.5 | 52% | +90% | - |
| 7 | Completed Match | 50% | +100% | - |
| 8 | US Open WTA: Marta Kostyuk vs Sloane Stephens Set 2 O/U 8.5 | 50% | +100% | - |
| 9 | US Open WTA: Marta Kostyuk vs Sloane Stephens Set 1 O/U 9.5 | 50% | +100% | - |
| 10 | US Open WTA: Marta Kostyuk vs Sloane Stephens Set 2 O/U 9.5 | 50% | +100% | - |
| 11 | US Open WTA: Marta Kostyuk vs Sloane Stephens Set 2 O/U 10.5 | 50% | +100% | - |
| 12 | US Open WTA: Marta Kostyuk vs Sloane Stephens Match O/U 21.5 | 39% | +156% | - |
| 13 | US Open WTA: Marta Kostyuk vs Sloane Stephens Match O/U 22.5 | 36% | +174% | - |
| 14 | US Open WTA: Marta Kostyuk vs Sloane Stephens Total Sets: O/U 2.5 | 28% | +264% | - |
| 15 | US Open WTA: Marta Kostyuk vs Sloane Stephens Match O/U 23.5 | 25% | +300% | - |
| 16 | US Open WTA: Marta Kostyuk vs Sloane Stephens Set 1 O/U 10.5 BEST VALUE | 20% | +400% | - |
Real-money prediction market · Trade with confidence
This market refers to the tennis match between Marta Kostyuk and Sloane Stephens in the US Open WTA, originally scheduled for September 2, 2026 at 11:00AM ET. This market will resolve to 'Marta Kosty...
This prediction market tracks whether US Open WTA: Marta Kostyuk vs Sloane Stephens will occur, with $13K in total trading volume reflecting significant trader interest. Prediction markets aggregate the collective intelligence of participants who stake real money on outcomes, making them one of the most reliable forecasting tools available for events driven by team performance data, historical matchups, and real-time injury reports.
The market shows strong consensus: US Open WTA: Marta Kostyuk vs Sloane Stephens is priced at 86%, indicating traders overwhelmingly expect this outcome. At this probability level, the potential return on a correct bet is relatively low, but contrarian positions carry significant upside if the consensus proves wrong.
Trading activity is exceptionally high, with $13K traded in the last 24 hours alone (100% of total volume). This surge often indicates breaking news, a key deadline approaching, or a significant shift in market sentiment.
This market is scheduled to resolve by 2026-09-09. As the resolution date approaches, expect increased trading activity and tighter probability estimates. Historical data shows that prediction market accuracy improves significantly in the final days before resolution.
As of Sep 02, 2026 at 10:35 UTC, the leading outcome is US Open WTA: Marta Kostyuk vs Sloane Stephens at 86% probability, with $13K in total trading volume on Polymarket.
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