Seattle Mariners vs. Detroit Tigers

Platform comparison

Active sub-markets

Market context

The Seattle Mariners travel to Detroit for a regular-season matchup against the Tigers on 7 June at 1:40 PM ET, with settlement occurring nine days later on 14 June. The 0% implied probability registered on this contract sits notably distant from typical sportsbook opening lines for MLB games of comparable competitive balance, where even heavily favoured teams rarely trade below 55–60% win probability. This divergence suggests either extreme confidence in Detroit's prospects or limited liquidity in the prediction market relative to traditional betting venues.

Historical precedent indicates that single-game MLB contracts settling this far from the event date—a nine-day window—occasionally reflect incomplete information pricing, particularly when key roster announcements or injury updates emerge between market opening and game time. The Mariners and Tigers occupy different competitive tiers within their division; Seattle's recent performance trajectory and Detroit's mid-season form will determine whether the current probability reflects genuine analytical consensus or a data-sparse artefact. Traders should monitor official starting pitcher confirmations, which typically finalise 24–48 hours before first pitch and can materially shift win probabilities depending on recent form and matchup history.

Catalyst watch should focus on any roster moves, weather delays affecting the scheduled 1:40 PM start time, or late-breaking injury reports from either club. Cross-platform comparison with DraftKings, FanDuel, and Betfair's in-play odds will reveal whether the prediction market's extreme positioning reflects genuine disagreement or simply lower trading volume relative to established sportsbooks.

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 Best Prediction Markets UK, which mirrors the Polymarket order book directly.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Where can I trade this market with the lowest fees?

On Best Prediction Markets 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?

Best Prediction Markets 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 does it cost to trade on Best Prediction Markets UK?

Zero. Best Prediction Markets 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 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.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Best Prediction Markets UK triggers a quick verification flow that finishes in minutes.