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ATPCHALLENGER·Mon 1:00 PM ET

Felix Balshaw vs Stefano Napolitano

Felix Balshaw is the current favorite at $0.70 ask on Kalshi and $0.67 ask on Polymarket — an implied ≈68% chance. Prices as of 06:52 UTC on Jul 13, 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.

Felix Balshaw

ATPCHALLENGER

Mon 1:00 PM ET

Stefano Napolitano
66%68%72%1:21 AM1:36 AM1:53 AM2:06 AM2:19 AM70¢67¢

Moneyline

Felix Balshaw3¢ gap
Kalshi70¢Polymarket67¢
Stefano Napolitano1¢ gap
Kalshi32¢Polymarket33¢

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.