National Bank Open: Aryna Sabalenka vs Moyuka Uchijima

Platform comparison

Market context

Polymarket is pricing Aryna Sabalenka to advance against Moyuka Uchijima at about **95% YES**, so the contract is trading as a heavy favourite rather than a live coin-flip. On Polymarket, the outcome settles in USDC on Polygon via conditional tokens, and this market resolves to Sabalenka only if she advances; if the match is not played, is abandoned without a winner, or drifts beyond the seven-day delay rule, it reverts to 50-50 instead.

That price is consistent with the broader tennis market view: Sabalenka is the WTA world No. 1, while Uchijima is ranked around No. 107 in the live listings, and bookmakers have posted Sabalenka around 1.03 to 1.07 in the moneyline equivalent, implying an extremely lopsided contest.[3][5][10] Comparable previews also call Sabalenka the likely winner in straight sets, with total-games lines skewing to the under, which is the sort of setup that usually leaves limited room for an upset unless the favourite is compromised.[1][2][12]

For traders, the main catalysts are operational rather than thematic: final order of play, any weather or scheduling shifts in Toronto, and whether the match actually begins on the stated evening. The National Bank Open listing and match pages indicate the fixture is on the round-two schedule, while sportsbook and tennis live pages are the quickest places to spot last-minute time changes or walkover risk before the contract’s settlement logic becomes relevant.[4][5][13][16]

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 Polymarket Scam?, 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

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.

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's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

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 Polymarket Scam? trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.