National Bank Open: Ann Li vs Elena Rybakina

Platform comparison

Market context

Elena Rybakina’s match against Ann Li was still being priced as a one-sided encounter in the hours before play, with bookmaker and preview markets giving Rybakina a heavy advantage and some outright prices around the mid-80s to high-80s in implied win probability. That matters for the current 0% YES reading on Ann Li: it reflects a market that has not found a live pathway for the lower-seeded player, rather than a late shift towards uncertainty.[2][7][1]

The main historical frame is simple: Li has no recorded main-tour head-to-head with Rybakina, and preview notes describe this as a first meeting, while Li’s record against the likely calibre of opponent in this section of the draw is poor. Rybakina, by contrast, sits far higher in the rankings and has been the consistent favourite in pre-match models, which is the usual setup for a short-priced favourite in a straight-sets market.[9][1][8]

For traders, the key catalysts are whether the match starts on schedule, whether there is any revised order of play from Toronto, and whether there is an in-play retirement or walkover risk if weather or scheduling pushes the session back. The market rules make those operational details decisive: if the match is not played at all, or is delayed beyond seven days without a winner, it settles 50-50, while any completed advance for Li would be the only clear path to a YES outcome.[4]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track National Bank Open: Ann Li vs Elena Rybakina across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

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

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.

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%.