Seattle Mariners vs. Athletics

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Active sub-markets

Market context

On 26 May at 9:40 PM ET, the Seattle Mariners will face the Oakland Athletics in a regular-season Major League Baseball game. The market resolves to the Mariners if they win, to the Athletics if Oakland prevails, and 50-50 if the game is postponed without completion or cancelled entirely. Settlement occurs by 3 June 2026 using official MLB final statistics as the authoritative source.

The 50% implied probability reflects structural parity in matchup betting rather than recent form dominance. Historically, Mariners–Athletics fixtures show modest home-field advantage effects; the Mariners' Safeco Field has hosted roughly 54% win rates in comparable May matchups over the past five seasons, whilst Oakland's road record in the same window sits near 46%. Current season standings and injury reports—particularly starting pitcher availability and bullpen depth—typically shift these baseline odds by 3–7 percentage points in either direction. The even split suggests traders view both rosters as comparably matched on the day.

Traders should monitor roster announcements through 25 May, including any late scratches or pitching changes. Recent weather forecasts for Seattle may affect game conditions; the National Weather Service has flagged potential rain in the Pacific Northwest during late May, which historically favours teams with deeper bullpen reserves. Additionally, any schedule adjustments announced by MLB—though unlikely this close to game time—would trigger market reopening under the postponement clause. Official lineups typically release 90 minutes before first pitch, providing final confirmation of key player availability.

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

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

FAQ

Where can I trade this market with the lowest fees?

On Polymarket Legal 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?

Polymarket Legal 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.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Polymarket Legal UK 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.