Seattle Mariners vs. Baltimore Orioles

Platform comparison

Active sub-markets

Market context

The Seattle Mariners travel to Baltimore for a regular-season matchup against the Orioles on 11 June at 7:05 PM ET. Polymarket currently prices this contract at 100% YES, meaning traders are pricing in near-certainty that one team will win outright rather than face postponement, cancellation, or a tie—an outcome that would trigger a 50-50 split. The settlement window extends to 18 June, allowing a week for makeup games should weather or unforeseen circumstances delay play.

Historical precedent suggests such extreme pricing reflects the rarity of MLB games ending without a winner. Since 2000, fewer than 0.5% of regular-season games have been cancelled without makeup dates or ended in ties. The Orioles and Mariners have played 19 times since 2015, with Baltimore holding a 10-9 edge. Neither franchise has experienced a cancelled fixture against the other in that span. The 100% probability essentially prices in the baseline expectation that baseball operates as scheduled.

Traders monitoring this contract should track weather forecasts for Baltimore in the days leading to 11 June, particularly thunderstorm activity that could trigger delays. Roster announcements from either team—particularly injuries to key pitchers—could shift underlying game odds but would not affect the binary resolution unless they somehow prevented play entirely. The Orioles' recent form and Mariners' injury status remain secondary to the mechanical certainty that this game will be decided on the field rather than by administrative action.

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

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

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.

What does it cost to trade on Polymarket UK?

Zero. Polymarket UK 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, Polymarket UK triggers a quick verification flow that finishes in minutes.