Billy King's early goal earned Dundee United a 1-0 win over Ladbrokes Championship leaders St Mirren at Tannadice on Tuesday.
A draw would have seen Saints clinch the title but the home side gave their play-off hopes a big boost with a vital victory and the Paisley club now have another opportunity to seal the silverware at home to Livingston on Saturday.
Jack Iredale struck in stoppage time as Morton edged out Dumbarton 3-2 at Cappielow to stay just outside the top four and Inverness CT are up to sixth place after a 1-0 home win over Falkirk.
Montrose moved to the top of Ladbrokes League 2 thanks to a 3-0 victory away to bottom club Cowdenbeath, helped by a Lewis Milne double. The match between Berwick Rangers and Stenhousemuir at Shielfield was postponed.