Seattle Mariners vs. Pittsburgh Pirates

Platform comparison

Active sub-markets

Market context

The Seattle Mariners, sitting 41–40 and leading the AL West, face the Pittsburgh Pirates, who are 40–40 and fourth in the NL Central, in an MLB game at PNC Park on 25 June at 12:35pm ET. The contest features probable starters Chandler (2–7, 4.62 ERA) for the Pirates and an unnamed Mariners pitcher, with the total set at 8.5 runs and the Mariners favoured by 1.5 runs at –144 odds[1][2].

Historically, prediction markets assigning 0% implied probability to a team winning an MLB game have rarely resolved correctly unless the game was postponed or cancelled entirely; in comparable cases from 2023–2025, such extreme odds only materialised when weather or injury forced a no-play outcome, not when a team simply lost. The current 0% YES probability for the Mariners therefore suggests either a data anomaly or an expectation of non-play, despite both teams being active and the game scheduled[2][5].

Traders should monitor real-time updates on Chandler’s status and any weather alerts for PNC Park, as a postponement would keep the market open while a cancellation would force a 50–50 resolution. Recent expert picks from Action Network show a split consensus: Sean Koerner and Allan Lem favour the under 8.5 runs, while Jake and Frank Ammirante back the Pirates +130, indicating divergence between sportsbook lines and analyst views[2]. No official announcement has yet confirmed a delay, but the market’s extreme pricing warrants caution until the game concludes[6][7].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Seattle Mariners vs. Pittsburgh Pirates across five venues. We show live odds for Polymarket-based markets (sourced from the Polygon order book); for other venues we list platform attributes, since the comparable contracts are not exposed via a public API on every venue. Every CTA points at Best Prediction Markets UK — the application we operate, where you trade directly against the Polymarket order book at 0% fees.

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 Best Prediction Markets 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?

Best Prediction Markets 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.

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.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.