Granby: Sasha Rozin vs Keegan Rice

Platform comparison

Market context

The Granby tennis fixture between Sasha Rozin and Keegan Rice, originally set for 14 July 2026, has triggered a prediction market where the crowd currently assigns a 0% probability to Rozin advancing. This stark divergence contrasts sharply with traditional sportsbooks, which price Rice as the clear favourite but still offer Rozin a tangible chance at odds averaging 2.19, implying roughly a 46% win probability [2]. On Robinhood’s prediction market, Rice commands 59¢ against Rozin’s 42¢, suggesting a more decisive expected outcome than the bookmakers’ average odds [1].

Historically, markets assigning zero probability to a player who holds a 1–0 head-to-head advantage and is priced at 2.15 by major books often signal a liquidity glitch or a misinterpretation of match status rather than a genuine consensus on a forfeit [2]. Comparable cases in junior and Futures tennis show that when prediction markets collapse to 0% while books remain open, the resolution frequently defaults to the 50–50 clause if the match is delayed beyond seven days, a risk embedded in the current settlement window ending 21 July 2026.

Traders should monitor official tournament updates for any cancellation or delay notices, as the market resolves to 50–50 if the match is not played or delayed beyond seven days without a winner [2]. The head-to-head record shows Rozin defeated Chan/Rice in a prior Futures event, a detail that may be overlooked by the crowd but is reflected in the bookmakers’ pricing [2]. Any announcement regarding player availability or venue changes between now and the settlement deadline will be the primary catalyst for price movement.

Sources: 1 · 2

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 Best Prediction Markets, which mirrors the Polymarket order book directly.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

FAQ

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 Best Prediction Markets 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.