New York Yankees vs. Boston Red Sox

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Active sub-markets

Market context

The underlying real-world event is the MLB game between the New York Yankees and Boston Red Sox at Fenway Park on 26 June, where the Yankees must win to resolve this market. The current crowd-implied probability of 0% YES for the Yankees is starkly misaligned with the teams’ recent form, as the Red Sox defeated the Yankees 6-3 just two days prior on 25 June, a result that temporarily boosted Boston’s confidence despite their poor season record of 32-46[1]. Historically, such extreme probabilities in head-to-head MLB matchups often precede sharp reversals when the favoured team suffers a key injury or when the underdog’s recent winning streak is ignored by the market; for instance, in the 2004 ALCS, the Yankees were heavily favoured yet lost a pivotal game after a critical bullpen collapse, illustrating how single-game outcomes can defy long-term season trends[7].

Traders must watch for immediate line-up announcements, particularly regarding the Yankees’ DH Giancarlo Stanton, who was placed on the 10-day injured list with a leg issue, and the Red Sox’s infielder Marcelo Mayer, now on the 10-day list for a bone stress reaction in his left ulna[2][3]. These injuries directly impact offensive depth and could swing the game’s momentum, especially given the Yankees’ current 48-31 record and first-place standing in the AL East versus the Red Sox’s fifth-place position[1]. Additionally, monitor the official starting pitcher confirmations, as Travis MacGregor of the Red Sox is on the 60-day IL, which may force Boston to rely on a less experienced rotation arm, a dependency that could be exploited by the Yankees’ superior batting line[4]. The settlement window ending 3 July 2026 allows for potential postponements, but the immediate catalysts are the injury updates and confirmed line-ups released before the 7:10PM ET start.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). The odds column is filled only where we have clean data — that avoids the made-up numbers that get a network demoted when search engines cross-check against the source venue.

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.

FAQ

Where can I trade this market with the lowest fees?

On Champions League Prediction, 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?

Champions League Prediction 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.

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'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, Champions League Prediction triggers a quick verification flow that finishes in minutes.