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

Platform comparison

Market context

Polymarket currently prices Jiang/Wu at **0% YES**, so the contract is effectively marked as a near-certain Mertens/Shnaider outcome on the market, not merely a tennis upset price. Because the market settles on the pair that *advances* — and falls back to 50-50 if the match is cancelled, starts but is unfinished, or is delayed beyond seven days — traders are really betting on both the result and the completion rules embedded in the USDC- and Polygon-based conditional token contract. [1][4]

That 0% print sits well below the broader market consensus elsewhere. Tennis.com’s pre-match projections listed Mertens/Shnaider as the projected winner at 74%, while other odds boards put Jiang/Wu around a 23% to 29% chance and Mertens/Shnaider around 71% to 77%. [5][9][16] In that context, Polymarket’s current price looks less like a calibrated probability and more like a thin, one-sided book with little displayed liquidity, which can happen when a market has already moved hard or when order flow is sparse. [4]

The main catalysts to watch are straightforward: official match status, any schedule shift, and whether the doubles tie is actually played to completion before the seven-day window closes. Tennis.com and other scoreboards indicate this was a National Bank Open women’s doubles Round 2 match, so any withdrawal, walkover, weather interruption, or late court change could matter as much as the pre-match favourite. [2][6][13] If play begins, the settlement language on Polymarket becomes decisive, because an unfinished match does not resolve to the on-court leader unless the contract’s completion condition is met. [1]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews National Bank Open (Doubles): Jiang/Wu vs Mertens/Shnaider across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to PolyGram, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

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.

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.