National Bank Open: Sho Shimabukuro vs Marin Cilic

Platform comparison

Market context

Polymarket is pricing the Sho Shimabukuro side at **0% YES**, which leaves the contract effectively signalling no active belief in a Shimabukuro advance on USDC-settled conditional tokens on Polygon. For traders, that is less a view on the tennis itself than a market structure read: if the event is not completed as defined, the contract can still settle 50-50, so the key question is whether the match is actually played to a decision inside the settlement rules.

The broader frame is that this is a first-round National Bank Open meeting between a lower-ranked Japanese player and Marin Cilic, with live listings placing the match in Montréal on hard courts and before August’s main draw traffic settles down. Public match pages and models leaned towards Cilic pre-match, with projections ranging from roughly 56% to 61% for Cilic and around 39% to 44% for Shimabukuro, while one live odds page showed Cilic at about 12-to-1 on the exchange-style listing and another forecast had Cilic as the projected winner. That background helps explain why a Shimabukuro YES contract can sit near zero even before the tennis ball is struck.

The main catalysts are administrative, not just sporting: final start time, any court reassignment, and whether the fixture is completed inside the seven-day window after the scheduled date. Live match listings show the scheduled start around 22:00 UTC on 2 August in Montréal, but if there is a late withdrawal, suspension, or a start without completion and no advancing player within the market’s rules, settlement can shift away from a straight win/loss outcome. For a Polymarket user, the practical watchlist is whether the ATP draw, tournament feed, and live score providers continue to treat it as an active, completed match rather than a cancellation or unfinished contest.

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Methodology

This page reviews National Bank Open: Sho Shimabukuro vs Marin Cilic 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

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.

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.

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.