Athletics vs. Arizona Diamondbacks

Platform comparison

Market context

The Oakland Athletics defeated the Arizona Diamondbacks 5–2 in their MLB matchup on Monday night, 20 July 2026, at Phoenix’s home stadium. Jeff McNeil delivered the decisive pinch-hit single in the seventh inning to secure the go-ahead runs, while pitcher Harris recorded his seventh save of the season [3][4]. The game concluded with a three-run victory for the Athletics, confirming the outcome that the prediction market now reflects at 100% YES probability.

Historically, prediction markets locking at 100% before settlement typically follow a completed event where the result is unambiguous and officially recorded by the governing body. In MLB, once a game finishes with a clear winner and no tie or cancellation, resolution is immediate and definitive, mirroring past cases where sportsbook lines converged with final scores post-game [1][4]. The divergence here is minimal: pre-game sportsbook odds favoured the Diamondbacks at -168 moneyline, while analyst consensus projected a 6–4 Diamondbacks win, yet the actual result reversed that expectation entirely [1][8].

Traders should monitor the official MLB final statistics page for any post-game adjustments, though no such revisions are anticipated given the game’s completion and clear scoreline [1]. The settlement window ending 2026-07-28 allows ample time for verification, but the outcome is already fixed by the 5–2 result confirmed by ESPN and CBS Sports [1][4]. No further announcements, schedule changes, or dependencies affect this contract, as the event has concluded and the resolution source is definitive.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Best Prediction Markets 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

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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 Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Best Prediction Markets UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.