National Bank Open: Zachary Svajda vs Arthur Fils

Platform comparison

Market context

Polymarket is pricing this contract at **0% YES** today, which implies no meaningful market expectation that Zachary Svajda will advance over Arthur Fils before the settlement window closes on 13 August. On Polymarket, the position is settled in **USDC** on **Polygon** through conditional tokens, so the practical question is not just who is favoured on court, but whether the scheduled match is actually played and produces a clear winner under the market rules.

The tennis context points strongly towards Fils. The pair have no prior head-to-head record, but Fils is the higher-ranked and more established player, listed around ATP No. 22 versus Svajda around No. 76, and third-party previews put Fils at roughly an 80% win probability or better. Comparable markets on this matchup have also leaned heavily to Fils rather than to an upset, which helps explain why a Svajda win is effectively being treated as a longshot in price terms.

A trader still needs to watch the tournament schedule, because the contract can resolve to **50-50** if the match is not played, ends in a tie, or is delayed beyond seven days without a winner. Live draw and start-time updates matter most here: the match is listed for Montréal on hard court, but the actual path to settlement depends on whether it begins and whether a winner is officially recorded. If the event is moved, postponed, or interrupted before completion, the on-chain outcome can diverge sharply from the pre-match betting view.

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Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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.

UK Frequently Asked Questions

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 UK. 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.

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%.