Morton closed the gap on League 1 leaders Stranraer to a single point thanks to a 2-0 victory at Cappielow on Saturday.
Declan McManus and Mark Russell scored late in each half to earn Jim Duffy's men a crucial win against Stephen Aitken's team.
Forfar are also just a point off the pace after beating Dunfermline 1-0 at Station Park, Stephen Husband scoring the only goal of the game against his former club.
Brechin City are into the play-off places following a 1-0 win at bottom club Stirling Albion. Alan Trouten's 61st-minute penalty was the difference between the teams.
Late goals from Gary McDonald and Andy Rodgers (penalty) earned Peterhead a 2-0 win over Ayr United at Balmoor.
Bryan Prunty bagged a double as Airdrieonians saw off Stenhousemuir 2-0 at Ochilview.