National Bank Open: Mirra Andreeva vs Karolina Pliskova

Platform comparison

Market context

Mirra Andreeva is still priced as the clear favourite, but the key change in the last day is that the match is now effectively live on multiple markets ahead of the Toronto round-two slot, with Andreeva trading around the low-70s to mid-70s in implied win chance and Plíšková in the mid-20s. That keeps the crowd’s 100% YES reading for Andreeva as an extreme figure rather than a consensus estimate, because the underlying tennis pricing is much less one-sided than the market suggests.[1][7][14]

The historical frame is straightforward: Andreeva is the higher-ranked, younger, and more heavily backed player, while Plíšková still brings serve-first profile and enough tour pedigree to make straight-set outcomes less certain than a pure ranking gap implies. Public previews and odds feeds point to Andreeva being favoured, but not to the kind of inevitability that a 100% probability would normally signal; comparable books are showing Andreeva around -330 to -375 rather than an unpriced lock, with some models nearer 76-77%.[7][12][18]

The main catalysts to watch are simple and operational: final scheduling confirmation, whether the match starts on time, and any late withdrawal, weather delay, or court-order reshuffle at the National Bank Open. If the draw is held to its published round-two placement, the market should stay anchored to Andreeva unless there is a pre-match injury note or an in-match retirement scenario; if the fixture is postponed beyond the market’s settlement window, the contract mechanics matter more than the tennis edge.[1][5][14]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track National Bank Open: Mirra Andreeva vs Karolina Pliskova 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

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 Prediction Today. 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%.