Rangers closed the gap on William Hill Premiership leaders Heart of Midlothian to just three points thanks to a 2-0 home win over Aberdeen this evening.
Emmanuel Fernandez and Nico Raskin scored the goals in the first half for Danny Rohl's side, who head for Pittodrie on Sunday.
Livingston v St Mirren was postponed due to a frozen pitch.
Raith Rovers are through to the quarter-finals of the KDM Evolution Trophy after beating Queen of the South 1-0 at Stark's Park. Airdrieonians overcame Montrose 3-1 at the Albert Bartlett Stadium to ensure their progress.
The other last-16 ties were postponed and rearranged for Tuesday January 13.