Kilmarnock and Rangers face a replay at Ibrox after last night's 0-0 draw at Rugby Park.
But top-flight rivals Hibernian and Championship duo Dundee United and Partick Thistle did win through yesterday.
Saturday's Scottish Cup results:
- East Fife 0-1 Partick Thistle
- Hibernian 3-1 Raith Rovers
- Kilmarnock 0-0 Rangers
- St Mirren 1-2 Dundee United