National Bank Open: Elise Mertens vs Anna Bondar

Platform comparison

Market context

Elise Mertens’s second-round meeting with Anna Bondar at the National Bank Open is priced like a near-certain Mertens advance, with the crowd-implied probability at **100% YES** and no meaningful market indication of a live upset. That is broadly in line with the matchup data: Mertens leads the head-to-head 2-0 in available records, including a straight-sets win on hard court in Toronto in 2022, while Bondar is still positioned much lower in the rankings and has the weaker hard-court profile.[1][3][4]

Comparable form and surface numbers also frame this as a one-sided contract rather than a balanced coin flip. Mertens has the stronger overall 2026 record and a better hard-court return profile, while Bondar’s results against top-50 opposition on hard have been poor in recent season summaries.[3][6][14] The fact that all readily available tennis data sources point the same way helps explain why there is little visible divergence between analyst-style consensus and the prediction market price; if anything, the contract looks more extreme than a standard sportsbook line, where a favourite of this magnitude would normally trade at heavily shaded odds rather than a literal certainty.[6][15]

For traders, the main catalysts are operational rather than analytical: official match scheduling, any court or weather delay, and whether the fixture is completed within the seven-day settlement window.[13][16] Live scoreboards and draw pages already show the pairing as active in the Toronto/National Bank Open feed, so the key risk is not who starts favourite but whether the match proceeds as planned or is disrupted enough to trigger the market’s 50-50 fallback.[10][12][16]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews National Bank Open: Elise Mertens vs Anna Bondar 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 Best Prediction Markets, 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

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.

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