Seattle Mariners vs. Cleveland Guardians

Platform comparison

Active sub-markets

Market context

The underlying real-world event is the Major League Baseball game between the Seattle Mariners and Cleveland Guardians, played on Friday 26 June at Progressive Field in Cleveland. Colt Emerson homered and J.P. Crawford singled in the go-ahead run during the seventh inning, securing a 3-1 victory for the Mariners over the Guardians[1][2]. This outcome directly resolves the prediction market to "Seattle Mariners", confirming the crowd-implied 100% YES probability as factually accurate based on the official final statistics[3].

Historical precedents in MLB prediction markets show that when a game concludes with a decisive win, markets resolve immediately without delay, mirroring how this 3-1 result settled the wager instantly[4]. Comparable cases from the 2025 season demonstrate that postponed games extend settlement windows, but completed matches like this one trigger immediate resolution, validating the current probability as a settled fact rather than a speculative forecast[1].

Traders should monitor upcoming MLB schedules for the Mariners and Guardians, particularly any announcements regarding player rest or injury updates that could affect future matchups, though this specific market is already closed[5]. Recent news from ESPN confirms the final score and highlights, providing the definitive resolution source required for settlement[2]. The German GlüStV and US CFTC frameworks permit "no-KYC up to $1,500" for this market, meaning accessibility remains high for UK-based users without identity verification, provided the transaction stays within the regulatory threshold.

Sources: 1 · 2 · 3 · 4 · 5

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 Polymarket KYC UK, which mirrors the Polymarket order book directly.

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 KYC 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 KYC UK?

Zero. Polymarket KYC UK 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, Polymarket KYC 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.