Arizona Diamondbacks vs. St. Louis Cardinals

Platform comparison

Active sub-markets

Market context

The Arizona Diamondbacks face the St. Louis Cardinals at Busch Stadium on 22 June for a 7:45pm ET MLB contest, with the market currently pricing a Diamondbacks win at just 14%. This low probability mirrors historical patterns where Arizona’s away form collapses against mid-table Cardinals squads; the Diamondbacks sit 15–21 on the road, while St. Louis holds a strong 21–17 home record[1][3]. Comparable cases from the 2024 and 2025 seasons show Arizona winning only 32% of away games against similar-strength opponents, often hampered by poor run support and bullpen fragility[1].

Key catalysts for traders include the confirmed absence of Cardinals infielder Carlos Santana, who is expected out until at least 25 June due to a thigh injury[2]. Pitching dynamics also loom large: Merrill Kelly’s diminished miss rate and elevated damage profile contrast with Andre Pallante’s steadier base against Arizona’s harsh right-handed split[1]. Traders should monitor late bullpen announcements and any weather updates for Busch Stadium, as both teams have shown volatility in high-scoring, bullpen-dependent games recently[1]. The Cardinals’ season-high 16-hit, three-homer performance against Minnesota suggests they can capitalise on Arizona’s road struggles if the bullpen holds firm[1].

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

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

Is this market available outside the US?

Sport Prediction 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.