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WTA·Mon 5:00 AM ET

Sofia Costoulas vs Tereza Valentova

Tereza Valentova is the current favorite at $0.82 ask on Kalshi and $0.83 ask on Polymarket — an implied ≈83% chance. Prices as of 14:14 UTC on Jul 12, 2026, delayed about five minutes. Source markets: Kalshi · Polymarket. Resolution follows each venue's own market terms.

Curious how long a gap like this stays open? We measured it.

Sofia Costoulas

WTA

Mon 5:00 AM ET

Tereza Valentova
18%20%22%24%6:20 AM6:23 AM6:26 AM6:27 AM6:30 AM19¢19¢

Moneyline

Sofia Costoulas
Kalshi19¢Polymarket19¢
Tereza Valentova1¢ gap
Kalshi82¢Polymarket83¢

Prices delayed about five minutes. Each venue's best ask per outcome; Kalshi asks are derived from its NO bids (ask = $1 minus the bid). Kalshi volume counts contracts, Polymarket volume is in dollars. Real-time prices and the full depth ladder are available via the WebSocket stream with an API key. Feed reference DINO-XKQZ7-9182.