Boston Red Sox vs. Seattle Mariners

Platform comparison

Active sub-markets

Market context

The underlying event is an MLB matchup between the Boston Red Sox and Seattle Mariners, originally set for 20:10 on 20 June but moved to 19 June at T-Mobile Park in Seattle. The Red Sox secured a 6–2 victory in that first game, snapping a four-game losing streak and taking a 1–0 series lead[1][4]. With the market showing 100% YES for the Red Sox to win the upcoming game, the crowd-implied probability suggests absolute certainty, yet the consensus overlooks the Red Sox’s poor road form: they are 1–4 in their last five away games[2].

Historically, teams with a 1–0 series lead and a recent win after a losing streak often face fatigue or overconfidence in the second game, especially when playing on the road against a balanced home side like the Mariners, who are 8–8 at home against sub-.500 opponents[2]. The value spot may lie contrarianly with the Mariners, as the 100% probability ignores the volatility of back-to-back games and the Red Sox’s road struggles. Traders should monitor the Mariners’ pitching rotation announcements and any late injury updates, as the schedule change compressed preparation time[5]. Recent coverage confirms the Red Sox’s series advantage but notes the uncertainty of the second game’s outcome[4].

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 Who Will Win 2026, 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.

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.

What does it cost to trade on Who Will Win 2026?

Zero. Who Will Win 2026 routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

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.