National Bank Open (Doubles): Jiang/Wu vs Mertens/Shnaider

Platform comparison

Market context

The National Bank Open women’s doubles match between Jiang/Wu and Mertens/Shnaider is being priced very differently across venues: the crowd-implied probability on this contract is still **0% YES**, while match-specific odds pages and tennis scoreboards point to Mertens/Shnaider as the clear favourite. Yahoo Sports listed the pair level at the time the match reached a deciding stage, and both Sofascore and 365Scores have treated Mertens/Shnaider as the stronger side, with Rue des Joueurs showing best available prices around 1.28 for Mertens/Shnaider versus 3.65 for Jiang/Wu.[2][6][9][10] In other words, the market’s zero bid is far below the broader cross-platform consensus and looks more like a stale or event-handling artefact than a true read on match quality.

That gap is easier to read against the tennis context. Mertens is a proven doubles specialist and Shnaider has also been active in high-level doubles in 2026, whereas Jiang/Wu’s recent doubles record appears more mixed on tennis stats sites.[16][17][19][15] Historical treatment of doubles markets also matters: prediction contracts in tennis can move from normal pricing to a 50-50 settlement only if the match is abandoned, not played, tied, or left unresolved beyond the market’s time limits, so traders should watch for official completion status rather than just live scoring. ESPN’s tournament scoreboard shows the match in the women’s doubles draw alongside other completed and suspended matches, which makes any scheduling disruption or retirement the key catalyst for settlement risk.[4]

For traders, the main live triggers are official draw updates, court-order changes, and whether the match is marked final, suspended, or abandoned by the tournament feed. The National Bank Open’s official event pages and Tennis.com’s tournament coverage are the most relevant sources for any late walkover, delay, or score correction, and those are the developments that would matter more than pre-match opinion once the contract is tied to an actual winner or a non-completion clause.[1][5][17]

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.

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'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 Best Prediction Markets trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.