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Tennis·Mon 10:30 AM ET

Stefano Napolitano vs Zsombor Piros

Zsombor Piros is the current favorite at $0.80 ask on Kalshi and $0.80 ask on Polymarket — an implied ≈80% chance. Prices as of 01:07 UTC on Jul 21, 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.

Stefano Napolitano

Mon 10:30 AM ET

Zsombor Piros
19%20%21%23%24%10:56 PM10:59 PM11:01 PM11:04 PM11:05 PM22¢21¢

Moneyline

Stefano Napolitano1¢ gap
Kalshi22¢Polymarket21¢
Zsombor Piros
Kalshi80¢Polymarket80¢

How this settles

Spread
Read each venue's rules

Kalshi

The following market refers to the Piros vs Napolitano professional tennis match in the 2026 ATP Challenger Zug Round Of 32 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.

Polymarket

This market refers to the tennis match between Zsombor Piros and Stefano Napolitano in the Zug, originally scheduled for July 20, 2026 at 4:00AM ET. This market will resolve to 'Zsombor Piros' if Zsombor Piros advances against Stefano Napolitano. This market will resolve to 'Stefano Napolitano' if Stefano Napolitano advances against Zsombor Piros. If the match is canceled (not played at all), ends in a tie, or is delayed beyond 7 days from the scheduled date without a winner determined, this market will resolve to 50-50. If the match begins but is not completed, and one player advances due to the opponent's retirement, default, or disqualification, this market will resolve to the player who advances. If the match ends in a walkover (player withdraws before the start and the other advances automatically), this market will resolve to 50-50. The primary resolution source will be official information from the ATP Tour. A consensus of credible reporting may also be used.

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. How the market matching API works · Real-time WebSocket API docs. Feed reference DINO-XKQZ7-9182.