National Bank Open: Mirra Andreeva vs Karolina Pliskova

Platform comparison

Market context

Polymarket has **Mirra Andreeva** priced as a heavy favourite in this contract, and the market is effectively implying that she will advance against Karolina Pliskova rather than treating the event as a coin flip. The underlying match is a National Bank Open women’s singles round-of-32 meeting in Toronto, with the market’s settlement tied to who advances, while a no-contest outcome, tie, or a delay beyond seven days would push the contract to 50-50 under the stated rules.[1][5]

That kind of pricing lines up with the wider tennis market: listed match odds and model-based previews mostly point to Andreeva, with several feeds showing her in the low-to-mid 70s on implied win probability and moneyline prices around -315 to -375, versus Pliskova in the mid-20s to low-30s range.[7][10][12][17] For a Polymarket user, the key point is that the contract is trading on the same basic question as a standard moneyline, but settlement depends on the official advancement outcome in the tournament bracket, not on set score or market sentiment alone.

The main catalysts are practical rather than speculative: final scheduling, any court or weather delay, and whether the match is completed inside the market’s seven-day window. The event page currently shows the match as upcoming, while related listings suggest it is already on the slate for Toronto action, so traders will be watching for any rescheduling or late withdrawals that could trigger the contingency language.[1][4][15] Because the contract is built on USDC on Polygon with conditional-token settlement, the binary path only resolves once the tournament result is official, so pre-match odds matter less than whether play starts and finishes as expected.

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.

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%.