Celtic were surprisingly beaten 2-0 by Kilmarnock at Parkhead this afternoon, with Cillian Sheridan and Liam Kelly grabbing the goals.
Elsewhere, Aberdeen were in complete control at the Pittodrie Stadium, securing a 2-0 win over Dundee.
Ross County mounted an impressive second-half comeback at Hearts this afternoon, though a late John Sutton goal meant the points were shared in a 2-2 draw at the Tynecastle Stadium.
Another late goal was scored by David Robertson, who cancelled out Billy McKay's opener for Inverness Caledonian Thistle, to secure a point in a 1-1 draw for St Johnstone.
A 69th-minute penalty from Johnny Russell gave Dundee all three points away at St Mirren.