St Mirren moved out of the relegation play-off places in style with a 4-1 win over local rivals Morton at Cappielow on Tuesday evening.
Stelios Demetriou's opener was cancelled out by Andy Murdoch but Stevie Mallan restored their lead with a fine finish just after the break and John Sutton added the third from close range.
Gary MacKenzie rounded off a great night for Jack Ross' side with a header from a corner as Jim Duffy's men slipped to fourth in the Ladbrokes Championship table.
Dundee United are up to third place following a 1-0 victory over Dunfermline Athletic at Tannadice thanks to a first-half goal from Thomas Mikkelsen.
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