US Open WTA: Aryna Sabalenka vs Elena Rybakina odds: Kalshi vs Polymarket
Sat, Sep 12, 2026, 4:00 PM ET · WTA tennis matches · $17k traded in 24h across both venues.
Aryna Sabalenka: Kalshi 57¢ vs Polymarket 55¢, +2.5 pp
Mid prices. A price is the market's probability: 57¢ means 57%. The gap is Kalshi minus Polymarket in percentage points.
Two separate exchanges, two accounts. Links may carry a referral code, which never changes what is shown. Disclosures.
-3.23¢ per $1, after fees
Buy Aryna Sabalenka @ Polymarket 56¢, Elena Rybakina @ Kalshi 44¢
All outcomes
| Outcome | Kalshi bid / ask | Polymarket bid / ask | Gap |
|---|---|---|---|
| Aryna Sabalenka | 57¢ / 58¢ | 54¢ / 56¢ | +2.5 pp |
| Elena Rybakina | 43¢ / 44¢ | 44¢ / 46¢ | -1.5 pp |
Price history, last 3 days
How this is matched
Games are matched across the two exchanges by league, team codes and date. Polymarket prices come from its live order book, Kalshi from its public API. Refreshed every 45 seconds.
What this is not
Read-only. Nothing here places or routes orders and nothing is advice. Fees, slippage and the time it takes to move money between venues are not in these numbers.