Wycombe failed to take advantage against 10-man Oldham as substitute Tony Carss scored a late equaliser for the visitors in a 2-2 draw at Adams Park.
Oldham, unbeaten on their travels this season, took the lead through Wayne Andrews' fifth goal of the season after 26 minutes - a header following John Eyre's corner.
Julian Baudet was then dismissed for Oldham just after the break following a nasty tackle on home midfielder Steve Brown.
Darren Currie then crossed for fellow substitute Richard Harris to level matters with a looping header after 71 minutes.
Wycombe went ahead when visiting midfielder Chris Armstrong fouled Danny Senda in the penalty area, allowing Brown to fire the ball home from the spot 12 minutes later.
But that joy lasted just 60 seconds, with Carss pouncing on a loose ball to equalise.