National Bank Open: Caty McNally vs Alexandra Eala

Platform comparison

Market context

Caty McNally’s meeting with Alexandra Eala at the National Bank Open is being priced very differently across venues, with the crowd-implied probability at 0% YES even though Tennis.com’s pre-match model gives Eala a 68% projected win and String Tension’s Elo model puts her around 60%, or roughly -150 in moneyline terms.[3][5] That leaves a clear gap between the contract price and the broader tennis market. McNally’s recent form has been solid by volume, with a 42-22 record over the past 52 weeks, while Eala has gone 38-26 and owns a stronger hard-court profile at WTA level, which matters because Toronto is played on hard courts.[1]

Comparable-case reading favours treating the 0% print as more of an extreme market stance than a literal no-chance view. Eala is ranked higher on the main event preview, at world No. 28 to McNally’s No. 73, and has already reached the last 16 of WTA 1000 events four times in her career, all on hard courts.[3][9] McNally, by contrast, has improved against stronger opposition this season, but her overall WTA hard-court record remains below .500, which helps explain why model-based odds lean to Eala despite the contract’s zeroed-out crowd price.[1][9]

Traders should watch for any late schedule changes from the tournament, since the market only pays out on an actual advance and falls back to 50-50 if the match is not played, ends level, or is delayed beyond seven days without a winner.[10] The National Bank Open match page and live scoreboard already list the contest as upcoming with no completed stats, so the key catalyst is whether the fixture starts on time and reaches a formal result.[10][13] If the draw is reshuffled or the match is postponed, settlement mechanics matter as much as the on-court favourite.[10]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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 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.

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.

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.