St Mirren qualified for the fifth round of the Scottish Cup in emphatic fashion with a 6-1 away win over Second Division club Peterhead.

A Paul McGowan hat-trick, a Paul McQuade brace and a single from Aaron Mooy did the damage for the Buddies who moved through to the next phase with ease.

In other Scottish Cup matches on Tuesday night, Ayr United defeated Hibernian 1-0, Partick Thistle eliminated Falkirk 1-0, Dundee United got past Ross County 4-3 on penalties after a scoreless draw and Dunfermline Athletic beat Montrose in an eight-goal thriller.

The Pars cruised to a two-goal lead before a Callum Woods won goal gave Montrose hope until three second-half goals from Dunfermline made it 5-1.

But the Third Division club hit back twice through Paul Tosh to provide a scare for the home side who were able to make it 5-3.

Dunfermline now meet Aberdeen in the next round whilst Ayr take on St Mirren. In other confirmed round five fixtures, Hamilton Academical host Dundee United, St Johnstone meet Partick Thistle and Old Firm rivals Rangers and Celtic tangle at Ibrox.