Seattle Mariners vs. Athletics

Platform comparison

Active sub-markets

Market context

The Seattle Mariners face the Oakland Athletics on 25 May at 9:40PM ET in a regular-season Major League Baseball matchup. The market currently reflects a 52% implied probability favouring a Mariners victory, suggesting traders view the matchup as marginally competitive despite Seattle's stronger recent performance and roster composition.

The Mariners have maintained a winning record in most seasons since 2021, whilst the Athletics have undergone significant roster reconstruction following their relocation announcement to Las Vegas. Historical head-to-head records between these franchises show the Mariners have generally held an advantage in recent years, though individual game outcomes remain volatile. The current 52-48 split reflects this structural imbalance without overweighting it, suggesting the market accounts for the inherent unpredictability of single-game baseball outcomes where pitching matchups, weather conditions, and injury status can shift expected value substantially.

Traders should monitor starting pitcher assignments and any late roster changes announced in the days preceding the fixture. Injury reports for key position players—particularly those affecting offensive production—typically emerge through official MLB channels and team announcements in the 24 hours before game time. Weather conditions at T-Mobile Park in Seattle, where the game will be played, may influence ball carry and defensive positioning. Recent form and bullpen availability, which fluctuate based on usage in preceding games, represent additional variables affecting win probability. The settlement window extends to 2 June 2026, providing sufficient time for game completion or rescheduling should postponement occur.

Methodology

This page tracks Seattle Mariners vs. Athletics across four political prediction venues. Live odds come from the Polymarket order book (the deepest political prediction-market book). Kalshi is the CFTC-regulated US alternative, Betfair the established UK sports-exchange with politics markets, Manifold the open play-money variant. PolyGram routes every trade through to Polymarket — at 0% fees.

Resolution & payout

Political markets typically settle on official candidate or agency confirmation. Polymarket uses UMA Optimistic Oracle: a proposer posts the outcome with a bond, the two-hour window opens, then the smart contract pays USDC.

Kalshi settles USD via CFTC clearinghouse, with clearly defined resolution sources (e.g. AP race calls for elections). Betfair settles after the official outcome is registered with the league or agency. Manifold is play-money.

FAQ

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 PolyGram?

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

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.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, PolyGram 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.