National Bank Open: Mariano Navone vs Arthur Fils

Platform comparison

Market context

Arthur Fils’ meeting with Mariano Navone at the National Bank Open is being priced like a routine hard-court edge, but the market’s 19% YES implies a notably stronger view of Navone than the tennis head-to-head and ranking profile would suggest. The pair have only one prior meeting, with Navone winning 2-0 on clay in Prague in 2022, so that result is a limited guide to an ATP hard-court contest in Montreal.[3][6] Fils’ overall career record is stronger, and his hard-court win rate is materially higher than Navone’s, while Navone’s career numbers are still skewed towards clay.[1]

That is why this contract is best read as a divergence between surface-adjusted tennis metrics and a lower market price on Navone. Independent preview and odds pages have generally leaned to Fils, with one comparison site listing him as a heavy favourite at around -398 and another preview making him the pick at 1.51, which is much shorter than the prediction-market figure would imply.[2][14] The only meaningful counterweight is Navone’s previous win in the matchup and the fact that he has shown enough level on hard courts to upset expectations in isolated matches, but those sources still describe his hard-court sample as far weaker than Fils’.[1][11]

For traders, the key catalysts are simple: confirmed draw placement, any late schedule shift, and whether the match is played to completion before the settlement window closes. Tennis markets of this type often move on official order-of-play updates, injury or withdrawal news, and whether either player is managed through a compressed Masters schedule; if the match is delayed beyond seven days or not played, the contract can settle 50-50 under the rules.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews National Bank Open: Mariano Navone vs Arthur Fils 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 Best Prediction Markets, 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 Best Prediction Markets. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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 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.