Carlisle bounced back from three straight league defeats to earn a surprise 1-0 win at promotion-chasing Oldham.
Boundary Park had its biggest crowd of the season, 8,564, after Oldham slashed ticket prices, but the Cumbrians' substitute Craig Curran was the match-winner.
Oldham could have taken an early lead as Reuben Reid pulled wide and Filipe Morais saw a blistering drive beaten out by Carlisle goalkeeper Adam Collin.
Carlisle's Ben Marshall went close from 20 yards, but Collin denied the home side again after a fine run by Cedric Evina.
The visiting goalkeeper then tipped away Oumare Tounkara's effort, while Oldham substitute Warren Feeney produced a tame finish when well placed.
The deadlock was broken 10 minutes from time as Marshall's right-wing cross deflected to Curran for a tap-in at the far post.
There was more drama to come with angry exchanges sparking a brawl, which saw Oldham assistant manager Gerry Taggart sent off for clashing with visiting players.
The outstanding Collin had the final word with another superb save to keep out Morais in the closing stages.
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