National Bank Open: Zachary Svajda vs Arthur Fils

Platform comparison

Market context

Zachary Svajda’s match with Arthur Fils in Montréal is priced oddly at 0% YES, but the underlying tennis case is not close to even. Fils is the higher-ranked player and the stronger season performer: tennis stats sites put him around ATP 22–24 with a 2026 record of 23–9, while Svajda is around ATP 76–87 with a 27–18 season mark and a weaker career profile overall.[5][6][8] The pair have no prior head-to-head record, so this is being read mainly through ranking, hard-court form and tour-level volume rather than any direct matchup history.[1][2][3]

Comparable markets on Polymarket, Kalshi, Betfair and Smarkets will usually point to the same directional edge, but they present it differently. Exchange-style venues such as Betfair and Smarkets quote decimal odds, with the market-implied probability sitting inside the price after commission, whereas Polymarket and Kalshi display the contract more directly as an implied probability and embed different fee and access structures. For this match, a trader comparing books would expect any discount to Fils to come less from tennis fundamentals than from execution frictions: commission on exchanges, spreads, and whether the user can clear KYC and regional access checks on each platform.

The main catalysts are straightforward: the tournament schedule, whether the second-round slot is confirmed, and any late injury, retirement or withdrawal news. Flashscore and tennis.com both list the fixture for 5 August 2026, but the resolution risk matters because if the match is not played, ends level, or is delayed beyond seven days without a winner, this market settles 50–50 rather than to either player.[6][8] If play starts but is not completed, the advancing player should determine settlement, so the key watch-items are official order-of-play updates, courtside postponements and any medical timeout or withdrawal reports from the National Bank Open organisers.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares National Bank Open: Zachary Svajda vs Arthur Fils specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. The live probability is the Polymarket mid; the comparison columns summarise each venue's fee structure, KYC, settlement currency and payment rails. Every CTA routes to Kalshi Alternative, which mirrors the Polymarket order book at 0% fees.

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.

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. Kalshi Alternative has a different geo footprint and routes to Polymarket's order book at 0% fees.

Are all these platforms regulated?

No. Kalshi is CFTC-regulated (US). Betfair and Smarkets are UK Gambling Commission licensed. Polymarket operates without explicit regulation — a different risk profile than a regulated sportsbook.