Motherwell moved 10 points clear of bottom club St Mirren with a 5-0 victory over Gary Teale's side at Fir Park on Tuesday night.
Lee Erwin's double had Ian Baraclough's men in command and Scott McDonald added a third goal before the break. John Sutton came off the bench to score twice and complete an emphatic win for the in-form Steelmen.
Ross County continued their superb run of results, beating St Johnstone 1-0 in Dingwall to stay three points outside the bottom two.
Liam Boyce got the only goal with six minutes left to move Jim McIntyre's men to within a point of Partick Thistle as they made it seven wins and a draw in their last eight games.