Cleveland Guardians vs. Detroit Tigers

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Market context

Cleveland and Detroit meet in the AL Central with the market leaning strongly towards the Tigers despite Cleveland’s better recent form. The crowd-implied probability of 16% for a Guardians win sits well below a typical near-even baseball moneyline, suggesting the contract is pricing in both Detroit’s home edge and the belief that Cleveland’s result is more likely to be a one-off than a trend. That looks broadly aligned with the team records, with Cleveland at 29-22 and Detroit at 20-30, but it also leaves room for disagreement if the gap between season-long results and short-run performance matters more than standings alone.

The recent head-to-head results are the main historical frame: Cleveland beat Detroit 8-2 on Monday and the Tigers have now lost five straight, while the Guardians are on a five-game winning run. MLB.com’s standings page also shows the Guardians at 8-2 over their last 10 and the Tigers at 20-30 overall, which helps explain why a 16% YES price may look low versus the recent series context. If sportsbook markets are showing Cleveland around the +130 to +140 range for individual games, that would imply a materially higher win chance than this contract, so the contract appears to be discounting the Guardians more aggressively than the broader betting market.

Traders should watch the starting pitcher confirmation, any late line-up rest after the series opener, and whether either club makes a day-game adjustment after playing on consecutive days. ESPN’s game listing on Monday showed Slade Cecconi starting for Cleveland in the previous game, but the key for this matchup is who gets the ball and how strong the line-up cards are once posted. Any late move in the moneyline or a confirmed scratch would matter more than the standings at this point, particularly with a settlement window running to 28 May in case of postponement or a make-up game.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Cleveland Guardians vs. Detroit Tigers on the five venues with material liquidity for prediction markets. Live odds come from the Polymarket Polygon order book — the only source that ships real-time data under an open licence. For Kalshi, Betfair and Manifold we list platform attributes (fee, KYC, settlement, payment) instead of fabricated odds, because their APIs use non-comparable contract definitions.

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

Is this market available outside the US?

PolyGram 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.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, PolyGram triggers a quick verification flow that finishes in 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.