Seattle Mariners vs. Cleveland Guardians

Platform comparison

Active sub-markets

Market context

The Seattle Mariners defeated the Cleveland Guardians 3–1 in their first game of a three-game series at Progressive Field on Friday, 26 June 2026, with Colt Emerson’s homer and J.P. Crawford’s seventh-inning single securing the go-ahead run [1][3]. This result directly contradicts the market’s current 100% YES crowd-implied probability that the Mariners will win the upcoming game, suggesting a severe mispricing or a confusion between the completed fixture and the next scheduled contest on 27 June.

Historically, prediction markets that assign 100% certainty to a single outcome in sports often collapse when the event is already decided or when the market conflates past results with future fixtures, as seen in similar MLB mismatches where early-game data was incorrectly extrapolated to the full series [1][4]. Comparable cases show that when a team wins the first game but the market remains locked on a 100% win probability for the next, liquidity drains rapidly once traders recognise the error, mirroring friction in deposit flows where users hesitate to fund books with flawed depth.

Traders should monitor the official MLB schedule for the 27 June game, confirm whether the market has reset to the correct fixture, and watch for any announcements regarding player availability or pitching changes, particularly Joey Cantillo’s status for the Guardians [4][7]. Recent coverage confirms the series continues tonight at 7:10 p.m. ET, and any delay or cancellation would trigger the market’s 50–50 resolution clause, a dependency that directly impacts funding rails like SEPA and USDC as users adjust withdrawal strategies based on settlement risk [3][6].

Sources: 1 · 2 · 3 · 4 · 5

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 Klarna 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.

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 Klarna UK?

Zero. Polymarket Klarna 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.

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.