Warsaw: Gabriela Knutson vs Sofia Costoulas

Platform comparison

Market context

Gabriela Knutson’s match against Sofia Costoulas is still the live reference point in Warsaw, with the market sitting at **100% YES** even though the scheduled start was 3 August and the current settlement window runs to 10 August. That pricing reflects a straightforward match-up on outdoor hard court in Poland, where Costoulas is the higher-ranked player at WTA 158 against Knutson at WTA 217.[1][3][4]

The historical frame is limited but useful: Costoulas leads the head-to-head 1-0, and that meeting also came on hard courts, which makes this less of a pure coin-flip than a market might look at first glance.[1] Form and ranking also lean Costoulas’ way, with 2026 records showing 26-19 for the Belgian and 19-22 for Knutson, while Knutson’s career volume is slightly larger but less relevant than current level in a short-format WTA event.[1]

For traders, the key catalyst is not a fresh form update but whether the Warsaw schedule and score reporting confirm the match was actually played and completed within the seven-day settlement rule. SofiaScore and other live-event listings still show the fixture as the Warsaw match between the two players, while bookmaker pricing has consistently favoured Costoulas, suggesting the main risk is administrative rather than performance-related unless there is a late cancellation, walkover, or interruption.[3][12]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Warsaw: Gabriela Knutson vs Sofia Costoulas across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Prediction Today, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Prediction Today. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Prediction Today trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.