Grodzisk Mazowiecki: Joel Schwaerzler vs Andrea Guerrieri

Platform comparison

Market context

The Grodzisk Mazowiecki Challenger has already produced a full week of completed matches and finals on the ATP results feed, so the key live question is no longer whether the event exists, but whether Joel Schwaerzler’s scheduled meeting with Andrea Guerrieri is actually played before the settlement deadline. ATP’s current draws and results pages are the cleanest cross-check for whether the singles bracket still contains this pairing and whether the match has been pushed, walked over, or replaced by a retirement/withdrawal scenario.[1][17]

The market’s **100% YES** price is far more extreme than the way tennis probability usually behaves on prediction venues, where even strong favourites still leave room for late scratches, scheduling compression and tournament-specific risk. In Challenger events, comparable cases often settle away from the pre-match favourite once a withdrawal, walkover or unfinished match creates a non-standard outcome, which is why a perfectly certain implied price should be read cautiously until the ATP draw and live score pages confirm the exact status of this tie.[3][7][14][18] If the pair has been posted on sportsbook boards, the relevant comparison is whether those books still list a live moneyline or have already removed the market; any absence would usually point to a scheduling or availability issue rather than a true 100% win chance.

For traders, the main catalysts are the official ATP draw updates, same-day order of play, and any late medical or withdrawal announcement from the tournament, because the contract resolves to **50-50** if the match is cancelled, ends level, or is delayed more than seven days without a winner. The hard-court Challenger schedule in Grodzisk Mazowiecki has already shown multiple same-day finishes and a compact late-stage timetable, which means court allocation and player availability matter more than headline form when judging whether this contract can cleanly settle to one side.[1][3][5][17]

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 Kalshi vs Polymarket, which mirrors the Polymarket order book directly.

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 Kalshi vs Polymarket. 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.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

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.