Rangers go into Sunday's game against Hibernian at Easter Road having won all 11 matches in the Ladbrokes Championship this season.
Ayr United, who host Stranraer on Saturday, have racked up 10 matches without defeat in Ladbrokes League 1 since going down to Albion Rovers on the opening day of the season.
Ladbrokes Premiership leaders Celtic are unbeaten in five as they prepare to welcome Aberdeen to Parkhead while East Fife and Annan Athletic - both unbeaten in four Ladbrokes League 2 matches - go head to head at Bayview.
Current unbeaten league runs
10 Ayr United
5 Dunfermline Athletic
4 Annan Athletic
4 East Fife
4 Heart of Midlothian