Kosice: Guido Justo vs Lilian Marmousez

Platform comparison

Active sub-markets

Market context

A men's tennis match between Guido Justo and Lilian Marmousez is scheduled for 25 May 2026 in Košice, Slovakia, with the market settling on 1 June 2026. The 0% crowd probability reflects either minimal trading activity or strong consensus that one player will not compete. Both players compete on the lower-tier professional circuits; Justo, an Argentine, and Marmousez, a French player, typically feature in Challenger and ITF events rather than ATP main draws. The Košice venue hosts a Challenger-level tournament, making this a mid-tier professional fixture where upsets occur regularly and player availability can shift without notice.

Regulatory frameworks affect how UK and EU traders access this market. Under German GlüStV (gambling licensing), prediction markets on sports events face stricter classification than financial derivatives; however, no-KYC thresholds up to €1,500 (approximately £1,275) allow smaller stakes to settle without full identity verification on some platforms. US CFTC reach extends to any platform accessible to American residents offering event contracts, though enforcement focuses on larger operators. For this specific match, the low liquidity and 0% probability suggest minimal institutional participation, reducing regulatory scrutiny relative to major tennis tournaments.

Watch for tournament draw announcements and player withdrawal notices in the fortnight before 25 May. Injury updates, ranking changes, or last-minute scheduling conflicts can trigger resolution to 50-50 if the match is delayed beyond seven days without completion. Recent ITF and Challenger circuits have experienced fixture postponements due to weather and venue constraints; Košice's spring schedule occasionally faces delays. Traders should monitor official ATP/ITF calendars and the tournament's social media channels for confirmation that both players have accepted their spots.

Methodology

We track Kosice: Guido Justo vs Lilian Marmousez on the five venues with material liquidity for prediction markets. Live odds come from the Polymarket Polygon order book — the only source that ships real-time data under an open licence. For Kalshi, Betfair and Manifold we list platform attributes (fee, KYC, settlement, payment) instead of fabricated odds, because their APIs use non-comparable contract definitions.

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?

On PolyGram, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

PolyGram is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

What does it cost to trade on PolyGram?

Zero. PolyGram routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, PolyGram triggers a quick verification flow that finishes in minutes.