National Bank Open: Raphael Collignon vs Alexei Popyrin

Platform comparison

Market context

Raphael Collignon and Alexei Popyrin are due to meet at the National Bank Open, and the crowd price of 61% for Collignon implies the market is leaning towards the Belgian rather than the more established Australian. The most useful comparator is their only completed head-to-head: Collignon beat Popyrin 6-4, 6-2 on grass at Halle in June, which gives the underdog a clear recent reference point, even though that result came on a different surface.[3][4][16]

For context, Collignon has carried stronger recent form in the aggregate numbers available, with one source showing a 46-23 record over the past 52 weeks, while another lists him at 36-14 for the season and notes he has won 19 of 21 matches against non-top-100 opponents.[1][5] Popyrin’s profile is more volatile: he is a former Canadian Open champion, but one match preview notes he has only managed back-to-back main-draw wins three times this season and is defending quarter-final points, so the market is pricing both pedigree and inconsistency.[5][14] On platforms that quote **decimal odds**, that 61% implies roughly 1.64, before fees and margin; on prediction markets, the more relevant comparison is the net probability after liquidity and fees, whereas Betfair and Smarkets also layer on exchange commissions and may require stronger KYC depending on jurisdiction.

Traders should watch for final draw and schedule updates, because the market only resolves to a winner if the match is actually played and completed within the settlement window; if it is cancelled, tied, or pushed beyond seven days without a result, it goes 50-50. Popyrin’s status matters disproportionately because any withdrawal or late scheduling change would move the market from a live tennis view to a rules-driven settlement outcome, while the venue and Canadian summer conditions can also matter if organisers shift match timing.[14][5]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read National Bank Open: Raphael Collignon vs Alexei Popyrin from four platform perspectives: Polymarket (on-chain CLOB), Kalshi (CFTC-regulated exchange), Betfair Exchange (sports book exchange), Smarkets (peer-to-peer betting exchange). Polymarket's live mid is the canonical probability; the side-by-side columns benchmark fees, KYC, settlement currency and deposit rails so you can choose the venue that fits your jurisdiction and trade size.

Resolution & payout

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

FAQ

What does Polymarket cost vs Kalshi?

Polymarket: 0% fees, only Polygon network costs (~$0.01/trade). Kalshi: up to 7% per trade plus spread. For high-frequency traders, Polymarket is dramatically cheaper.

Which platform has the deepest liquidity?

Polymarket — by a wide margin. Top markets reach $50-500M volume, Kalshi ~$200M cumulative, Betfair similar. Deeper liquidity means your trade moves the quote less.

Is Betfair a Polymarket alternative?

Only partially. Betfair Exchange is UK-focused with a sports-betting emphasis; they have politics markets but with thinner liquidity than Polymarket. Settlement in GBP/EUR, 2-5% commission on winnings.

What about Smarkets as an alternative?

Smarkets is a UK betting exchange with a lower default commission (2%) than Betfair. Liquidity on political markets is below Polymarket, comparable to Kalshi. Geo-blocked in many jurisdictions.

Which platform is accessible globally?

Polymarket is geo-blocked in the US/UK/EU. Kalshi is US-only. Betfair and Smarkets are UK-restricted. Polymarket Alternative has a different geo footprint and routes to Polymarket's order book at 0% fees.