Arizona Diamondbacks vs. Seattle Mariners

Platform comparison

Active sub-markets

Market context

The Arizona Diamondbacks travel to Seattle on 31 May for an afternoon matchup against the Mariners, with first pitch at 4:10 PM ET. Polymarket currently prices a Diamondbacks victory at 25%, implying roughly 3-to-1 odds against Arizona. This valuation reflects the conditional token mechanics on Polygon: traders holding YES tokens profit if the Diamondbacks win, whilst NO holders benefit from a Mariners victory. The settlement window extends to 7 June, allowing for postponements or rescheduling without market closure.

Arizona finished the 2023 season with a 84-78 record and reached the World Series, whilst Seattle posted a 90-72 mark but missed the postseason. Head-to-head records between these clubs show competitive balance historically, though recent form and roster composition matter considerably. The Mariners have generally outpaced Arizona in regular-season matchups over the past three seasons, which partially explains the 25% probability weighting against the Diamondbacks.

Traders should monitor roster updates and injury reports through late May, particularly regarding starting pitchers assigned to this fixture. Weather conditions in Seattle—notably afternoon wind patterns that can suppress scoring—typically favour pitching-dominant teams. Any last-minute lineup adjustments or bullpen availability announcements could shift the conditional token pricing materially. The afternoon start time itself represents a minor factor, as teams sometimes show variable performance in day games versus evening contests.

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 Legit?, 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

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.

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.

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.