Seattle Mariners vs. Pittsburgh Pirates

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Active sub-markets

Market context

The Seattle Mariners, sitting first in the AL West at 40-39, face the Pittsburgh Pirates, who are even at 39-39 in the NL Central, in a game that concluded on 23 June at PNC Park. On Polymarket, this contract currently trades at 32% YES for the Mariners to win, implying a heavy market tilt toward the Pirates despite the Mariners' superior divisional standing. This price reflects the on-chain mechanics where USDC settles conditional tokens on Polygon, locking in a view that the Pirates’ home advantage and recent form outweigh the Mariners’ road record of 18-20.

Historically, similar matchups between a division-leading team with a poor away record against a balanced home team often resolve with the home side prevailing, even when the visiting team holds a better overall win-loss tally. Comparable cases from the 2024 and 2025 seasons show that when a team like the Mariners (40-39) travels to a mid-table opponent like the Pirates (39-39) with a sub-50% away record, the market frequently corrects to favour the home side, mirroring the current 32% implied probability for the Mariners.

Traders should monitor the probable pitchers and any late lineup changes, as George Kirby’s performance against the Pirates was a key factor in pre-game analysis. Recent predictions from Doc Sports highlighted the Pirates as the free play selection, citing their home strength and the Mariners’ away struggles as the catalyst for the outcome[4]. With the settlement window closed, the on-chain data now confirms the market’s initial read that the Pirates’ home dynamics were the decisive variable in this contest.

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 Legit?, 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 Legit? 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.

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 Legit??

Zero. Polymarket Legit? 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 Legit? triggers a quick verification flow that finishes in minutes.