Cleveland Guardians win the 2026 American League Championship Series priced at 41.4% on Polymarket, down 20.9 points, on $894K traded

The Polymarket contract on the Cleveland Guardians winning the 2026 American League Championship Series was priced at 41.4%, down 20.9 probability points, with $894K traded, in the Oct 18, 2026 · 3:24 PM ET update.

According to PredictionBubbles’ movers board, the Guardians contract was among the largest downward moves in sports. It appeared in a separate sports category, rather than as the board’s overall lead.

How the move is measured

PredictionBubbles ranks changes over 24 hours, using probability-point differences rather than relative percentage changes. The Guardians’ 20.9-point decline therefore measures the shift in the contract’s implied probability, not a 20.9% relative fall.

The supplied board snapshot drew prices from the venues on 18 Oct 2026, 19:12 UTC. According to PredictionBubbles, the page refreshes every 15 minutes and covers Polymarket and Kalshi, ranking 1,991 markets with lifespans longer than 14 days. Same-week fixtures are excluded, as are resolved contracts and markets without a valid 24-hour comparison.

What the figures do not establish

The supplied material does not identify a game result, team announcement or other catalyst for the Guardians’ decline. It establishes a substantial repricing, but does not explain why traders changed their assessment.

The $894K trading figure provides activity context, not a measure of available liquidity. PredictionBubbles says volume and liquidity do not influence its movement rankings, which depend solely on the size of the probability-point change.

What it means for prediction markets

• The direction is clear: the contract’s 41.4% price reflects a lower market-implied chance of a Guardians ALCS victory after the 20.9-point decline.
• The ranking has limits: this is a major downward sports move within the board’s eligible markets, not evidence that it led every market across categories.
• The cause remains unverified: neither the price change nor the reported trading volume establishes what drove the move or predicts the series outcome.