National Bank Open: Martin Damm vs Stefanos Tsitsipas

Platform comparison

Market context

Polymarket is pricing Martin Damm at 37% today, which leaves Stefanos Tsitsipas as the market favourite on a USDC-settled contract running on Polygon. The market resolves on who advances in the National Bank Open match originally scheduled for 3 August in Montreal, with a 50-50 fallback if the tie or cancellation conditions are met, so the key issue is not just the result but whether the fixture is played to completion.

The current price sits below the pre-match expectation on tennis data feeds, which have Tsitsipas around 63% projected win probability and Damm around 37%, broadly consistent with the ranking gap between ATP No 51 and No 104. That kind of split is typical when a seeded top-60 player faces a lower-ranked qualifier: the underdog can still attract a meaningful share if form, surface, or scheduling uncertainty narrows the edge, but the favourite remains the baseline read.

For traders, the main catalysts are line-up confirmation, court assignment, and any late schedule shift at the National Bank Open. The match has been listed as an upcoming Round 1 centre-court fixture, with some feeds showing an 8:10 p.m. ET start, so any delay, walkover, or broader tournament rescheduling would matter more here than in a straightforward completed match. On Polymarket, the on-chain position only settles when the contract’s outcome is determined, so news on whether the match starts, finishes, or is pushed beyond the seven-day window is the immediate market driver.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track National Bank Open: Martin Damm vs Stefanos Tsitsipas across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

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 PolyGram. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

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.

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.