Seattle Mariners vs. Athletics

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Active sub-markets

Market context

The Seattle Mariners travel to Oakland to face the Athletics on 27 May at 3:05pm ET in a regular-season matchup. The 1% implied probability reflects the Mariners' substantial advantage: they hold a winning record whilst the Athletics remain among baseball's weakest teams this season. Oakland has struggled with roster construction following the departure of key players, whilst Seattle has maintained competitive depth despite injury concerns to their rotation.

Historical context suggests that when one team carries a winning record against a rebuilding opponent, markets typically price the favourite at 85–92%, depending on pitching matchups and recent form. The 1% probability here sits well below comparable scenarios, indicating either significant uncertainty about pitcher availability or a market correction from earlier pricing. The Mariners' recent performance against bottom-dwelling teams has been consistent—they've won roughly 75% of such fixtures over the past two seasons, according to tracking by MLB analysts.

Traders should monitor lineup announcements before first pitch, particularly whether Seattle's catching position remains stable following recent injuries. The Athletics' pitching staff has shown marginal improvement in May, though their bullpen remains unreliable. Weather conditions at Oakland Coliseum could favour either team's approach; cooler temperatures typically reduce home-run distances. Any late roster moves or unexpected absences from either side would shift the probability meaningfully, though the Mariners' depth suggests they can absorb disruptions better than Oakland's thin bench.

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 Sport Prediction, which mirrors the Polymarket order book directly.

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 Sport 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?

Sport 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 does it cost to trade on Sport Prediction?

Zero. Sport Prediction 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, Sport Prediction triggers a quick verification flow that finishes in minutes.