Granby: Keegan Rice vs Arthur Gea

Platform comparison

Market context

The Granby Challenger Round of 16 match between Keegan Rice and Arthur Gea, originally set for 10:00 AM ET on 16 July, has already concluded with Gea securing the win, rendering the prediction market for Rice to advance effectively void [1]. Live score data confirms Gea defeated Rice in the second round, with the match finishing on 16 July 2026, meaning the event underlying the "YES" outcome has passed without the required result [2]. The current 0% crowd-implied probability for Rice reflects this completed reality rather than a speculative assessment of future odds.

Historical precedents in prediction markets for concluded sporting events show that probabilities collapse to zero immediately once official results are confirmed, as no further trading can alter the settlement outcome. In similar tennis challenger markets where a match finishes before the settlement window, the market resolves definitively based on the recorded winner, with no provision for reversion even if delays occur post-match [3]. The 50-50 tie clause applies only to cancellations or unresolved delays beyond seven days, conditions not met here given the match completion.

Traders should monitor the official tournament draw updates and ATP Challenger tour results pages for any potential appeals or score corrections, though such instances are rare in completed matches [4]. No further announcements regarding schedule changes are expected, as the Round of 16 stage has concluded and the next round fixtures are being confirmed. The settlement window ending 23 July 2026 will simply formalise the already-determined result, with Gea advancing as the confirmed winner.

Sources: 1 · 2 · 3 · 4

Methodology

We track Granby: Keegan Rice vs Arthur Gea across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

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.

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.

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.