FT Aberdeen 4-1 Queen of the South - McGinn, Considine, Cosgrove (2) for hosts; Dobbie had levelled with stunner
FT Hearts 4-0 Auchinleck Talbot - Berra, Mitchell, Maclean & Keena knock out juniors
FT Celtic 5-0 St Johnstone - Sinclair hat trick, Brown stunner & Forrest goal put holders into quarter-finals
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Clive Lindsay
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:
St Mirren are the only top-flight side to have so far suffered defeat in the fifth round.
On paper, the Buddies' home loss to a side from the Championship would be classified as a mini cup shock.
But many saw it coming with Oran Kearney's side bottom of the Premiership and Dundee United being in form as they chase promotion.
Indeed, the St Mirren manager even said before kick-off that Robbie Neilson's visitors went into the game as favourites after having spent a shed load on new players during January.
Celtic v St Johnstone (13:30)
Today's three cup ties have staggered kick-offs, with the all-Premiership meeting between Celtic and St Johnstone first up in a little under an hour's time in Glasgow.
Sunday's Scottish Cup fifth-round ties:
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It's day two of the Scottish Cup fifth-round weekend and we are still waiting for a major shock.
Today, it's the turn of Junior cracks Auchinleck Talbot and Championship side Queen of the South to have opportunity to make a name for themselves.
But odds are strongly in favour of Premiership sides Aberdeen, Celtic and Hearts making full use of home advantage.
Stay with us for the build-up, live commentary and post-match reaction on BBC Radio Scotland and online.