National Bank Open: Learner Tien vs Tommy Paul

Platform comparison

Market context

Polymarket is pricing Learner Tien at **39%** and Tommy Paul at **61%** on this contract, with settlement in USDC on Polygon via conditional tokens, so the market is effectively expressing a live view on who advances rather than who “should” win in the abstract.[1][13] With the market still open around the scheduled National Bank Open meeting, the on-chain price is the best read of crowd consensus today, and it also embeds the contract’s specific resolution rules if the match is delayed, abandoned, or left unfinished.[1]

That 39% sits close to outside moneyline and model reads that have Paul as a modest favourite. One bookmaker line shown for the match had Paul around **-175** and Tien around **+145**, while another odds board implied roughly **62%** for Paul and **38%** for Tien, which is very close to Polymarket’s split.[2][10] Tennis preview sites also pointed towards Paul, although some framed the match as competitive enough to go to three sets, which matters because a tighter than expected contest can shift sentiment even when the favourite remains unchanged.[4][9][17]

For traders, the key catalysts are simple: final line-up confirmation, any schedule change, and whether the match actually begins on time in Montreal. Polymarket’s own contract language makes the 7-day delay rule important, because a postponement past the window or a non-played match can push the market to a 50-50 resolution rather than a normal winner call.[1] The same market page also shows substantial turnover, so late updates from the tournament draw, order of play, or any retirement/withdrawal news can move the price quickly once the first set or match status becomes clearer.[1]

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 PolyGram, which mirrors the Polymarket order book at 0% fees.

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 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.

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 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.