Nicke Kabamba scored the only goal after 28 minutes as Kilmarnock edged out St Mirren 1-0 in Paisley to climb to fifth place.
Saints are now bottom of the table after Livingston defeated St Johnstone 2-0 at the Tony Macaroni Arena. Two goals in the space of two minutes towards the end of the first half from Scott Tiffoney and Alan Forrest made the difference.
Hamilton Accies hit back for a 1-1 draw with Dundee United at the Foys Stadium. Lawrence Shankland struck early on for Micky Mellon's men but defender Hakeem Odoffin levelled things up for Brian Rice’s team with 15 minutes left.
There are three games on Sunday - Motherwell host Rangers, live on Sky Sports at 12 noon, Celtic play Hibernian and Ross County face Aberdeen.
