Pronóstico: National Bank Open: Diana Shnaider vs Iga Swiatek

Platform comparison

Market context

Polymarket’s contract is pricing **Diana Shnaider** at 27% and **Iga Swiatek** at 73%, with settlement in USDC on Polygon through conditional tokens. For traders, the key point is that this is a binary advance-or-not market, so the on-chain payoff follows who is officially recorded as progressing, not who wins more games or sets.

The market is starting from a sample size of one completed meeting, which is not much to anchor a price, but it does point towards Swiatek. She beat Shnaider in their only head-to-head, a three-set match on clay at Madrid in April 2025, and several stat feeds list Swiatek as 1-0 in the matchup. That said, hard-court context matters here: the National Bank Open is played on hard courts, and some preview data note the pair have not met on that surface before, which makes direct carry-over from Madrid less reliable.

What should matter most over the next 24 hours is the tournament’s order of play, any weather or scheduling disruption, and whether either player withdraws or retires before the match begins. If the match is delayed beyond the market’s seven-day window without a winner, or is cancelled entirely, the contract resolves 50-50 rather than to either player. Live draw pages and match listings already have the fixture on the Toronto card, so the main trading catalyst is whether the match starts as scheduled and whether either side looks fit enough to complete it.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Pronóstico: National Bank Open: Diana Shnaider vs Iga Swiatek 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

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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 Polymarket Qué Es. 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.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

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.