Seattle Mariners vs. Pittsburgh Pirates

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Active sub-markets

Market context

The Seattle Mariners face the Pittsburgh Pirates in a Major League Baseball game at PNC Park on 24 June, with the Mariners needing a victory to resolve the prediction market favour. Current crowd-implied probability for a Mariners win sits at just 6%, suggesting the market views the Pirates as heavily favoured despite the Mariners’ 41-39 season record against the Pirates’ 39-40 standing[1].

Historically, such low implied probabilities for a team with a winning record often precede sharp reversals when the home side is overvalued; in comparable MLB matchups where the home team held a similar 3-2 recent form but the away side possessed a superior overall record, the away team won 58% of the time[2]. The divergence is notable: major sportsbooks list the Pirates as favourites at -118, while expert consensus from Picks Office and Ryan Minion leans toward the Mariners at +100, indicating a meaningful gap between book lines and trader sentiment[2].

Traders should monitor the final starting pitching announcements before the 6:40PM ET start, as any late change to the Pirates’ rotation could drastically alter the win probability[7]. Additionally, the over/under line is set at 8.0, with the Pirates having hit the game total over in 15 of their last 23 home games, a trend that may influence run-scoring expectations and indirectly impact the win margin[3]. No major injury reports have been released as of 25 June, but real-time roster updates remain the primary catalyst for probability shifts.

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 — 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, 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.

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 Best Prediction Markets?

Zero. Best Prediction Markets routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Best Prediction Markets 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.