Pronóstico: National Bank Open: Martin Damm vs Stefanos Tsitsipas

Platform comparison

Market context

Polymarket is pricing the contract at **37% YES** on USDC deposits and conditional tokens on Polygon, which means the market is still leaning towards Stefanos Tsitsipas but is leaving room for an upset by Martin Damm. The underlying event is a first-round National Bank Open match in Montréal on outdoor hard courts, and the current contract will settle to Damm only if he advances past Tsitsipas; if the match is not completed under the market rules, traders are exposed to the 50-50 fallback rather than a normal winner outcome.

That 37% reads as a sizeable underdog price, but not a pure longshot, which fits a matchup where the ranking gap is meaningful without being extreme. Tennis.com lists Tsitsipas at world No. 51 and Damm at No. 104, while the tournament’s own preview notes this is their first meeting and that Damm has recently broken into the top 100 after qualifying in Washington last week.[1][10] Comparable markets for similar ATP main-draw openers often trade above 60% for the higher-ranked player when there is no head-to-head history, so the present level suggests some respect for Damm’s serve and recent form rather than a broad market consensus that Tsitsipas cruises.[1][4][10]

For traders, the key catalysts are simple: the match must actually begin and reach a result before the settlement window closes on 2026-08-10, otherwise the contract can fall back to 50-50 under the rules. The main live drivers are scheduling changes, court assignments, weather delays in Montréal, and any last-minute withdrawal or walkover; the National Bank Open’s own Monday coverage and schedule pages are the most relevant places to check, alongside live scoreboards if the match starts late or is interrupted.[10][15][19] The Athletic’s recent watch guide still listed the pairing for Monday evening ET, which supports that the event is intended to be played, but a delayed start or retirement would matter more for settlement than the pre-match favourite price.[16]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Polymarket Qué Es, which mirrors the Polymarket order book directly.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Polymarket Qué Es. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.