National Bank Open: Learner Tien vs Tommy Paul

Platform comparison

Market context

Learner Tien and Tommy Paul are set to play an ATP National Bank Open match in Montreal, and the market is effectively pricing a live tennis handicap on whether Tien can get past a higher-ranked, more established opponent. The current crowd-implied probability of **39% YES** sits close to the broader betting market, where Tommy Paul has generally been a moderate favourite and Tien has been offered around the mid-30s to low-40s in implied win probability terms.[1][2][9][13]

For traders reading this programmatically, the useful comparison is not the headline probability but how it maps to similar pre-match tennis prices: books and prediction sites have mostly favoured Paul, with odds around -175 to -185 and model win rates near 62% for Paul versus 38% for Tien.[1][3][9][13][15] That kind of spread usually means the market is sensitive to small changes in schedule, surface assumptions, or any late information on form and fitness, rather than needing a dramatic news event to move.

The main catalysts to watch are whether the match remains on the published order of play, whether there is any delay, and whether either player is reported to be carrying a physical issue or is withdrawn before first ball. Recent listings show the fixture was expected on 7 August and some feeds had it moving into an overnight slot locally, which is the sort of scheduling drift that can matter for automated traders handling conditional orders and cancellation logic.[4][5][12][19] If the match is not played at all, ends without a winner, or slips beyond the settlement window rules, the contract can resolve to 50-50, so bot logic should monitor both official draw status and any ATP or tournament update before assuming a straight win-or-lose outcome.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews National Bank Open: Learner Tien vs Tommy Paul across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Kalshi Fees, which mirrors the Polymarket order book at 0% fees.

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 Kalshi Fees. 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.

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.

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.