Grodzisk Mazowiecki: Viktor Durasovic vs Andrea Guerrieri

Platform comparison

Market context

Viktor Durasovic’s match against Andrea Guerrieri in the Grodzisk Mazowiecki Challenger was listed as a round-of-16 meeting on Court 12, and live match pages showed Guerrieri as the higher-ranked player, around ATP 213 versus Durasovic around ATP 475. That ranking gap helps explain why a 0% YES price on Durasovic is effectively saying the market sees little chance of an upset, although the two have already met once and Guerrieri won that head-to-head in straight sets.[1][2][3]

Comparable books frame the same event differently. On Polymarket, the contract is a binary yes/no price, so 0% YES means Durasovic is treated as nearly impossible to advance; on Kalshi the same view would be shown as an implied probability, while Betfair and Smarkets would more often present decimal odds, with the trader’s realised price also affected by commission and spread. The practical difference is that a small move in the underlying tennis price can look much larger or smaller depending on whether the venue displays probability, odds, or a net-of-fees return; access can also vary because KYC and market availability are not identical across platforms.

The main catalysts are whether the match is actually played, when it starts, and whether any retirement, postponement, or walkover changes settlement. Match pages on 5 August showed the fixture as live or final at different times, which underlines how quickly tennis listings can move once courtside delays or score updates appear.[3][8] For a market with a 7-day settlement window, the key risk is not only who wins, but whether the event is completed cleanly inside the deadline, because no-result scenarios can push settlement towards 50-50 under the market rules.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Grodzisk Mazowiecki: Viktor Durasovic vs Andrea Guerrieri 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

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. 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.