Seattle Mariners vs. Washington Nationals

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Active sub-markets

Market context

On 13 June 2026, the Seattle Mariners will travel to Washington to face the Nationals in an MLB regular-season fixture scheduled for 4:05 PM ET. The market currently implies an 18% probability of a Mariners victory, reflecting the Nationals' home-field advantage and recent form. Under German GlüStV regulations, this market qualifies as a permitted prediction market event, whilst US CFTC oversight applies to the platform's derivatives classification. For traders in jurisdictions permitting participation without full Know Your Customer documentation, the $1,500 threshold typically governs accessibility; transactions below this level may proceed with reduced identity verification, though settlement obligations remain unchanged regardless of trade size.

Historical precedent for MLB matchups between these franchises shows the Nationals hold a marginal edge in head-to-head records over the past five seasons, though the Mariners have demonstrated volatility in June performance. The current 18% probability sits below the Nationals' typical pre-game favouritism, suggesting market participants are pricing in either recent Mariners momentum or uncertainty around starting pitcher assignment. Traders should monitor official roster announcements and injury reports released 48 hours before fixture time, as bullpen availability and key position player status materially shift win probability in regular-season play.

The settlement window extends to 20 June 2026 at 20:05 UTC to accommodate potential postponements due to weather or scheduling conflicts common in early summer baseball. Official MLB box scores serve as the sole resolution source; ties or complete cancellations without rescheduling would trigger a 50-50 split resolution.

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 Legal UK, which mirrors the Polymarket order book directly.

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

Where can I trade this market with the lowest fees?

On Polymarket Legal 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.

Is this market available outside the US?

Polymarket Legal UK 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 Legal UK?

Zero. Polymarket Legal UK routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

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.