National Bank Open: Gabriel Diallo vs Kyrian Jacquet

Platform comparison

Market context

Polymarket has this contract at **100% YES**, which means the market is effectively pricing Gabriel Diallo to advance over Kyrian Jacquet with no room left for disagreement. In practice, that price sits on USDC-settled, Polygon-based conditional tokens, so the only thing that changes the position is the exchange’s final resolution rule: if Diallo advances, the contract pays out on that outcome; if the match is not completed in a way that produces a winner, the fallback is the market’s 50-50 treatment.

That extreme pricing is broadly consistent with the wider pre-match read, even if traditional sportsbooks were closer to a short favourite than a certainty. Recent tennis previews and betting boards showed Diallo around the low-to-mid -100s or low 1.5s in decimal terms, while some models and tipsters still gave Jacquet a meaningful upset chance rather than a near-zero one.[1][2][12] For a Polymarket user, the important point is that a 100% print usually reflects either very thin liquidity, stale quoting, or a market that has already been fully migrated towards one side, rather than a clean statement that the underlying match is mathematically certain.

The main catalysts are operational rather than theoretical: whether the round-one match is actually completed, whether the tournament schedule shifts, and whether any withdrawal, walkover, postponement or abandonment triggers the contract’s 50-50 fallback. The National Bank Open listings also matter because they indicate the fixture was originally set for 2 August in Montréal, yet recent match pages and betting feeds suggest the event timing can move as results, court assignments and broadcast scheduling are finalised.[2][5][14] On Polymarket, traders are therefore watching not just who is better on court, but whether the match starts, finishes, and produces an unambiguous advancing player before the settlement window closes.

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

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

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.

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

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.