National Bank Open, Qualification: Maya Joint vs Ana Grubor

Platform comparison

Market context

Polymarket is pricing this contract as a near-certain **Maya Joint** advance, with the crowd-implied probability sitting at **100% YES** for her side. On the Polygon network, that means traders are effectively holding conditional tokens in USDC terms against a result that the market treats as overwhelmingly settled, even though the event still has to be officially completed or resolved under the contract rules.

The shape of the price is consistent with the pre-match hierarchy: Joint entered as the higher-ranked player, around WTA No. 76, while Ana Grubor was listed as a wildcard around WTA No. 534. National Bank Open coverage also framed Grubor as needing a major upset to qualify, which helps explain why comparable bookmakers and exchange-style listings priced Joint as the heavy favourite. In practical market terms, there is little historical room here for a surprise unless the match never finishes in the normal way or an official result is never posted.

What matters now is not the abstract matchup but the settlement path. Polymarket’s rules say that if the match is cancelled, ends in a tie, or drifts more than seven days past the scheduled date without a winner, the contract resolves to 50-50; if play starts but does not complete, the advancing player is the result. That makes the key catalysts any tournament scheduling change, retirement, walkover, or post-match confirmation from the National Bank Open and WTA score feeds. As of the latest tournament reporting, Joint and Grubor were still identified in the qualifying draw, with the National Bank Open’s own previews and recaps the most relevant public sources to watch for official advancement and finalisation.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track National Bank Open, Qualification: Maya Joint vs Ana Grubor 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.

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 PolyGram. 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.

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 PolyGram 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.