Boston Red Sox vs. Cleveland Guardians

Platform comparison

Active sub-markets

Market context

On 31 May 2026, the Boston Red Sox will face the Cleveland Guardians in a regular-season Major League Baseball fixture at 1:40 PM Eastern Time. The market currently reflects 46 per cent implied probability for a Red Sox victory, with settlement finalised by 7 June 2026. Official MLB statistics will determine the outcome; postponement extends the market's open period, whilst cancellation without a rescheduled game or any tie result triggers a 50–50 split resolution.

Historical matchup data and recent divisional performance provide context for interpreting the current probability. The Red Sox and Guardians have developed a competitive dynamic in recent seasons, with both franchises capable of sustained winning streaks. Comparable single-game markets in the 2025 MLB season typically reflected 45–55 per cent ranges for evenly matched opponents, suggesting the current 46 per cent reading indicates marginal underdog positioning for Boston. Injury reports, bullpen depth, and home-field advantage (the venue determines this factor) have historically shifted similar markets by 3–5 percentage points in the weeks preceding game day.

Traders should monitor roster announcements through late May, particularly starting pitcher confirmation and any late-breaking injuries to key position players. Weather conditions at game time—wind direction and temperature affect ball flight significantly in baseball—represent a secondary catalyst. From a regulatory perspective, this market's sub-$1,500 accessibility threshold under no-KYC frameworks in certain jurisdictions (notably absent from German GlüStV restrictions for sports events below specified stakes) and the CFTC's limited reach over non-financial derivatives mean settlement depends entirely on MLB's official records rather than regulatory oversight.

Methodology

This page is a comparison snapshot: one live quote (Polymarket), four reference venues with their key attributes, and a single execution path — every trade button routes to Polymarket Legal UK, 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

Where can I trade this market with the lowest fees?

On Polymarket Legal UK, 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?

Polymarket Legal UK 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'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.

Do I need to KYC for this market?

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

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.