National Bank Open: Caty McNally vs Alexandra Eala

Platform comparison

Market context

The National Bank Open meeting between Caty McNally and Alexandra Eala is being priced with Eala as the **favourite**, but the crowd-implied **22%** for McNally leaves the American in clear underdog territory. That sits below several model-style reads: Tennis.com’s matchup page gives McNally roughly a 32% chance, while String Tension’s Elo view leans Eala about 60-40, and both point to a match where the market is not expecting a major upset[3][5].

The historical frame is mixed. Eala has been stronger against lower-ranked opposition this season, winning 21 of 25 clashes versus outside the top 50, and she has reached the last 16 at WTA 1000 level four times, all on hard courts[1]. McNally, by contrast, has improved sharply against elite players, with two top-20 wins since April and a first WTA 1000 round-of-16 breakthrough in Madrid this summer[1]. That makes the contrarian angle straightforward: if traders expect McNally’s recent step up to carry over, the 22% line may understate her chances; if they weight rank, hard-court pedigree and season-long consistency more heavily, Eala remains the cleaner favourite[2][3].

What matters now is confirmation of the draw, start time and any late scheduling changes, because the market only resolves once a winner advances and reverts to 50-50 if the match is not played or is delayed beyond seven days[17]. Eala’s official event listing and live scoreboard pages show the fixture as an upcoming Toronto match, but pre-match tennis markets can move quickly if there is a withdrawal, a rain delay, or an order-of-play reshuffle[10][13]. For traders, the main catalyst is simple: whether both players actually take the court, and if they do, whether Eala’s tour-level hard-court edge translates against McNally’s recent upturn[1][3].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track National Bank Open: Caty McNally vs Alexandra Eala 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

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

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 Who Will Win 2026. 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.

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.

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.