National Bank Open: Mirra Andreeva vs Karolina Pliskova

Platform comparison

Market context

Mirra Andreeva’s second-round meeting with Karolina Plíšková at the National Bank Open is priced as a lopsided favourite spot across most venues, but the exact degree of confidence varies. Tennis.com’s match page gives Andreeva a 73% projected win probability, while market feeds compiled on the same day show bookmaker moneyline pricing around -330 for Andreeva and +330 for Plíšková, implying roughly a 77%–78% chance before vig removal.[1][7] By contrast, the prediction contract is sitting at a crowd-implied 100% YES, which is materially higher than both the sportsbook consensus and analyst models, and therefore leaves almost no room for uncertainty in the contract price.[1][7][10]

That gap matters because comparable Andreeva matches have usually been assessed as strong favourites, not certainties. Independent tipsters and model-based previews cluster around the mid-70s for an Andreeva win, with one algorithmic estimate at 75.9% and other previews in the 75%–77% range.[10][12] Sportsbook movement also shows the market leaning further towards Andreeva over the day, with the line moving from -294 to -330, but still nowhere near the certainty implied by a 100% contract price.[7] For comparison, Kalshi’s set-winner market for the same pairing was only pricing Andreeva around 73% for a related event, underscoring how much richer this contract appears than adjacent tennis markets.[14]

The main catalysts are simple but important: final order-of-play confirmation, any schedule shifts in Toronto, and whether the match is actually completed within the settlement window. The listed match page still describes the contest as upcoming, and the market rules mean any cancellation, no-contest, or delay beyond seven days would force a 50-50 settlement rather than a straight winner call.[1] Traders should also watch for live sportsbook and match-centre updates, because a walkover, retirement, or late change to the draw would alter resolution mechanics even if Andreeva remains the overwhelming pre-match favourite.[1][7]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Best Prediction Markets, which mirrors the Polymarket order book directly.

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.

FAQ

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 Best Prediction Markets. 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.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Best Prediction Markets trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.