National Bank Open: Valentin Royer vs Tommy Paul

Platform comparison

Market context

Polymarket is pricing **Valentin Royer** at about **18%** and **Tommy Paul** at **82%** on this USDC-settled, Polygon-based conditional token contract, so the market is leaning heavily towards Paul advancing. The event is the National Bank Open match between the two players, with settlement keyed to who advances, while a no-contest, tie, or delay beyond seven days from the scheduled date would push resolution to 50-50.

That price sits a little below most outside tennis models and bookmaker screens, which largely cluster around Paul in the high-70s to low-80s. Dimers has Paul at **78%**, Stats Insider at **78%**, and String Tension’s Elo-based view is **78.6%** for Paul, while broader betting prices also show Royer as a clear underdog.[2][1][9] In that sense, Polymarket’s 18% YES is slightly more bearish on Royer than the model consensus, but not by a wide margin.

The main trade catalysts are simple: whether the match starts on schedule, whether there is a late withdrawal or rescheduling, and whether any interruption forces the contract into its fallback rules. Kalshi’s parallel market shows the same basic setup and currently prices Paul near **80%**, which is a useful reference for where the broader prediction-market crowd is leaning.[6] Traders will also watch for official ATP and tournament schedule updates, because the settlement window runs to 13 August 2026 and any postponement beyond seven days from the original date changes the outcome mechanics rather than the tennis result itself.

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 Kalshi UK, 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.

UK Frequently Asked Questions

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.

Is Polymarket legal in the UK?

Polymarket is accessible to UK traders but is not UKGC-licensed. It operates under US CFTC jurisdiction. UK residents face no domestic legal prohibition on using it, but UKGC consumer protections do not apply. For UKGC-regulated alternatives, Betfair Exchange and Smarkets offer similar prediction-style markets.

Do I pay tax on prediction market profits in the UK?

UKGC-licensed platform profits (Betfair, Smarkets) are typically tax-free gambling winnings for UK individuals. Polymarket profits involve USDC crypto transactions, which HMRC treats as Capital Gains Tax events. Keep full transaction records and report via Self Assessment if gains exceed £3,000 per tax year.

How do I deposit on Polymarket from the UK?

UK traders typically fund Polymarket via Coinbase UK, Kraken or Revolut — buying USDC with GBP and transferring to a Polygon-compatible wallet (MetaMask, Coinbase Wallet). Polymarket's onboarding walks you through the bridging process. Typical GBP-to-USDC conversion costs 0.5–1%.