National Bank Open: Jessica Pegula vs Kamilla Rakhimova

Platform comparison

Market context

Jessica Pegula’s meeting with Kamilla Rakhimova in Toronto is priced as a near-certain Pegula advance across most venue-facing books, and that is broadly consistent with the wider market. Kalshi currently shows Pegula around 89¢/88% versus Rakhimova around 13¢/12%, while Dimers’ model is slightly less aggressive at about 86% for Pegula; by contrast, the crowd-implied 100% YES on this market is materially tighter than both and leaves almost no room for a surprise without a rerate. Decimal-odds books such as Betfair, Smarkets and other exchanges would typically express that same profile as a short-priced favourite rather than a binary quote, which makes small moves easier to see but also exposes traders to commission and thinner liquidity. [11][4][2]

That gap matters because Pegula’s price is anchored by rankings and surface context: she is the higher-ranked player and most pre-match previews frame her as the clear favourite on North American hard courts, with average bookmaker pricing clustered around 1.10–1.15 for Pegula and roughly 5.5–7.0 for Rakhimova. Historical comparisons in this sort of mismatch usually hinge on whether the favourite starts cleanly; a delayed or shortened contest can distort exchange pricing more than a straight best-of-three win. On Polymarket and Kalshi, the main issue is the binary contract structure; on Betfair or Smarkets, traders must factor in exchange commission and, in practice, KYC and jurisdiction limits that affect who can participate and at what size. [9][5][7][11]

The key catalysts are straightforward: confirmation that the match actually starts, any same-day schedule movement, and whether either player withdraws before first ball. Flashscore listings show the fixture as live in the 8 August window, while the market’s own settlement rules mean a cancellation, tie or delay of more than seven days would push it to 50-50 rather than a normal winner resolution. That creates a platform-specific angle: binary markets such as Polymarket and Kalshi can reprice sharply on late draw or walkover news, whereas decimal-odds books may simply suspend and repost, often with different fee treatment and access rules depending on location. [1][6][11][16]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares National Bank Open: Jessica Pegula vs Kamilla Rakhimova 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 Robinhood Prediction Markets, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Settlement is the biggest difference between the four platforms: Polymarket on-chain in USDC (instant), Kalshi USD via CFTC (T+1), Betfair and Smarkets in local currency via bank withdrawal (T+1 to T+3). On-chain settlement clears in minutes — the fastest payout path of the four.

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. Robinhood Prediction Markets 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.