Grodzisk Mazowiecki: Michele Ribecai vs Andrea Guerrieri

Platform comparison

Market context

The immediate change is that the market is still pinned at **0% YES** while the Grodzisk Mazowiecki match between Michele Ribecai and Andrea Guerrieri has not produced a winner yet, which is consistent with a tie-outcome or non-start risk being priced more than either side. Ribecai is the more visibly documented player in the public rankings: ATP and third-party trackers place him around the mid-200s in singles, with a career profile built almost entirely on ITF and lower-tier events rather than ATP main-draw runs.[1][2][4][6]

That framing matters because low-level men’s tennis markets often move less on name recognition than on whether the fixture is actually played and completed. Ribecai’s record shows most of his volume on clay and hard courts, with a modest winning profile that is plausible for these event levels but not strong enough on its own to justify a one-sided price in a live market.[2][4][5] By comparison, the absence of an established head-to-head and the lack of a clear ATP-level form edge from the available data make this the sort of match where settlement mechanics, not just player quality, can dominate the price.

The main catalysts to watch are the draw sheet, order of play updates, and any official postponement or walkover notices from the tournament, because the market can still resolve 50-50 if the match is cancelled, not played, or pushed beyond the seven-day deadline. If the fixture is on court, then the key dependency is simply whether both players are listed as active for the session and whether the result is completed before settlement. In practice, that means traders should monitor tournament scheduling rather than assume the current 0% implies certainty about the tennis itself.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Prediction Today, which mirrors the Polymarket order book directly.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

UK Frequently Asked Questions

Is this market available outside the US?

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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.

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Do I pay tax on prediction market profits in the UK?

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