Rangers overcame Queen of the South 2-1 at Ibrox to make it 10 wins out of 10 in the Ladbrokes Championship this season.
Derek Lyle gave Queens a first-half lead but Jason Holt equalised and Martyn Waghorn won it in the last minute as he made up for missing a penalty just before that.
Second-placed Raith Rovers edged out Alloa 1-0 at the Indodrill Stadium thanks to a 79th-minute goal from Grant Anderson.
Hibernian, in third, saw off Dumbarton 4-2 at Easter Road. Dominique Malonga, Liam Fontaine, Jason Cummings (penalty) and James Keatings got the goals for Alan Stubbs' team. Grant Gallagher and Steven Craig netted for the Sons.
Substitute Lee Miller struck in injury-time as Falkirk beat Morton 1-0 at the Falkirk Stadium to move four points clear in fourth place.
Stevie Mallan's early goal was enough to earn St Mirren a 1-0 win away to bottom club Livingston.