Aberdeen moved nine points clear in second place in the Ladbrokes Premiership with a 1-0 win over Motherwell on Saturday.
Niall McGinn grabbed a stoppage-time winner for the Dons to leave Well just three points above the relegation zone.
Hearts, in fourth, saw off Hamilton Accies 4-0 at Tynecastle with goals from Arnaud Djoum, Esmael Goncalves, Jamie Walker and Malaury Martin.
First-half goals from Paul Paton and Blair Alston earned St Johnstone a 2-0 victory over Dundee in the Tayside derby at McDiarmid Park.
Kris Boyd grabbed a late winner as Kilmarnock beat Ross County 2-1 in Dingwall after Liam Boyce cancelled out Conor Sammon's opening goal.
Gary Warren struck in injury time as bottom club Inverness CT earned a 1-1 draw away to Partick Thistle, who went ahead through Kris Doolan.
Leaders Celtic host Rangers on Sunday, live on Sky Sports at 12 noon.