Swiss Open: Juan Manuel Cerundolo vs Casper Ruud

Platform comparison

Market context

Juan Manuel Cerundolo has already defeated Casper Ruud 6-2, 1-6, 6-3 in the quarter-finals of the EFG Swiss Open at Gstaad, meaning the match described in this prediction market has physically occurred and concluded [2]. The market’s 100% YES crowd-implied probability reflects this settled outcome, where Cerundolo advanced past Ruud, aligning with the resolution condition that awards the ‘Juan Manuel Cerundolo’ outcome if he advances against Ruud [2]. Unlike traditional books like Betfair or Smarkets that display decimal odds (e.g., 1.01 for Ruud), Polymarket and Kalshi express this certainty as 100% implied probability, eliminating ambiguity in near-certain events while differing on fee structures: Polymarket charges no platform fees but includes maker-taker spreads, whereas Kalshi imposes a 1% cap on profits and requires full KYC [1].

Historical precedents in tennis prediction markets show that when a match is already played, markets resolve instantly once official results are confirmed, avoiding the 50-50 tie clause triggered by cancellations or delays beyond seven days [3]. Comparable cases from the 2024 ATP season demonstrate that platforms diverge on settlement speed: Kalshi often resolves within minutes of official confirmation, while Betfair may delay due to manual verification, creating arbitrage windows for traders monitoring real-time score feeds [2]. This distinction matters for traders comparing liquidity efficiency across platforms, as Polymarket’s on-chain settlement ensures immediate resolution once the blockchain confirms the result, contrasting with Kalshi’s centralised oracle process.

Traders should watch the official ATP Gstaad results page for any post-match appeals or score corrections, though Cerundolo’s victory is widely reported as final [2]. No further announcements are expected, as the quarter-final outcome is settled, and the settlement window ending 2026-07-24 serves only as a formal deadline rather than a catalyst for new information [1]. The key dependency is the absence of match delays beyond seven days, which is irrelevant here given the match’s completion, highlighting how Kalshi’s KYC requirements may limit access for international traders compared to Polymarket’s permissionless model [3].

Sources: 1 · 2 · 3

Methodology

We read Swiss Open: Juan Manuel Cerundolo vs Casper Ruud 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

Polymarket vs Kalshi — which is better?

Depends on your location. Kalshi is CFTC-regulated, US-only with full KYC. Polymarket is global, on-chain, no KYC up to $1,500. Polymarket has ~10x higher liquidity but higher regulatory risk.

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.

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.