National Bank Open: Learner Tien vs Gael Monfils

Platform comparison

Market context

Polymarket-style pricing on the contract is pointing strongly towards **Learner Tien**, with the market implying about **74%** for a Tien advance in the National Bank Open match against **Gael Monfils**. On-chain, that means traders are effectively buying exposure in USDC on Polygon via conditional tokens whose payout depends on the match outcome, with the 50-50 fallback only coming into play if the contest is not completed in the specified way.

That price is broadly consistent with the wider pre-match market. Bookmakers and preview sites had Tien as a clear favourite, with moneyline prices around **-300 to -325** for Tien and **+225 to +235** for Monfils, while several previews called a straight-sets win for Tien. The head-to-head also offered little to anchor a contrarian view, as the players had no recorded prior meetings in the cited tournament listings, so the market is leaning mainly on form, ranking, and surface expectations rather than direct matchup history.[1][2][3][13]

For traders, the main catalysts are simple: confirmation that the match is actually played, the final order of play, and any late withdrawals, weather disruption, or scheduling moves within the settlement window. Tournament and score feeds list the match in Montreal on 5 August, but the contract resolves by advancement, not by scoreline, so a retirement, walkover, or cancellation risk matters as much as the pre-match favourite status. If play is delayed beyond the market’s seven-day rule without a winner, the payout shifts to 50-50, so any dependency on tournament scheduling is directly relevant to the token price.[7][14][19]

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

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.

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%.