National Bank Open: Ann Li vs Elena Rybakina

Platform comparison

Market context

Polymarket is pricing the match between Ann Li and Elena Rybakina at **0% YES** for Ann Li, with the contract settled in USDC on Polygon through conditional tokens. That implies the market is treating Li’s advancement as effectively off the board, even though the underlying tennis event is a live second-week WTA matchup rather than an abstract name-versus-name contest.

That reading is consistent with outside books and preview sites, which have Rybakina as a heavy favourite. Current listed odds around 1.14–1.16 for Rybakina and roughly 5.0–5.7 for Li imply an expected win probability in the mid-80s to high-80s for the Kazakh, while Tennis Tonic also picks Rybakina in straight sets. Li is ranked around world No. 31, but Rybakina sits near the top of the draw at No. 2, so the market is effectively following the ranking gap and the broader class difference between the players.[1][2][3][5][9]

For traders, the main catalysts are procedural rather than narrative: official start time, any delay on centre court, and whether the match is completed normally. Polymarket’s rules mean a walkover or retirement does *not* pay out as a winner here; if the match is not played to completion, the contract resolves to the non-winner state, and a cancellation or excessive delay can push it to 50-50.[4] With the scheduled window already close and the market still open until 14 August, the most relevant watch items are tournament scheduling updates, withdrawal notices, and whether the posted start time slips enough to affect settlement mechanics.[4][10]

Sources: 1 · 2 · 3 · 4 · 5

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 Polymarket Alternative UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

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%.