National Bank Open: Caty McNally vs Alexandra Eala

Platform comparison

Market context

Polymarket is pricing Caty McNally against Alexandra Eala at **43%** for McNally, so the contract is still close to a coin flip on Polygon rather than a clear favourite. Because the market settles on who advances, not on raw match quality, traders are effectively holding a conditional token on the result being recorded before the settlement window closes; if the match is not played, is tied, or drifts beyond seven days without a winner, the outcome reverts to 50-50 under the market rules.

The numbers point to a modest edge for Eala, but not a dominant one. Tennis Ratio lists Eala at 38-26 over the past 52 weeks and McNally at 42-22, while also showing McNally with stronger recent overall form and Eala with a slightly better record against top-100 opposition. Tennis.com’s pre-match projection has Eala at 68% and McNally at 32%, with Eala ranked 28 and McNally 73, yet the absence of any prior tour-level head-to-head means the pricing is being set more by current form and ranking gap than by direct matchup history.

The main catalysts are straightforward: the match start time, any draw or schedule changes from the National Bank Open, and whether the WTA order of play holds. Live scoreboards from the tournament and major data feeds were already listing the fixture as upcoming, which matters for Polymarket users because any postponement, walkover, or retirement can change whether the token resolves to a player or to the 50-50 fallback. In practice, traders should watch official tournament updates first, then live scoring once play begins, since completion status determines the contract’s final settlement path.

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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 PolyGram. 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%.