Airdrieonians 3-3 Arbroath AET (4-2 pens)
Over in Airdrie the home side are celebrating a 4-2 shootout success after a thrilling 3-3 draw with Arbroath.
Dean McMaster with the decisive spot-kick.
Spartans 0-0 Inverness CT AET (4-2 pens)
The League 2 leaders spring a shock by beating Inverness Caley Thistle 4-2 on penalties.
Livingston 1-1 St Mirren AET (3-4 pens)
Malik Dijksteel rolls it into the corner and St Mirren are through.
Stevie May nets for Livi. That's 3-3 but St Mirren have a kick to win it.
Richard King's effort is saved by Jerome Prior!
A dismal penalty from Tete Yengi is easily saved by St Mirren's Shamal George.
If Richard King scores, St Mirren are through.
Kelty Hearts 1-1 Cove Rangers AET (5-3 pens)
David Eguaibor misses for Cove Rangers and Kelty Hearts win the shootout 5-3.
Poor Eguaibor scored an own goal earlier too.
The first Livi pen is skied over! Jeremy Bokila is the culprit.
Livingston 1-1 St Mirren
Airdrieonians 3-3 Arbroath
Kelty Hearts 1-1 Cove Rangers
Spartans 0-0 Inverness CT
Airdrieonians 3-3 Arbroath
Euan Henderson thinks he has a hat-trick for the hosts, but there's a linesman's flag fluttering for offside.
Livingston 1-1 St Mirren
Jeremy Bokila's header is tipped over the bar by St Mirren Shamal George. Five minutes to go...
Extra-time latest...
Livingston 1-1 St Mirren
Airdrieonians 3-3 Arbroath
Kelty Hearts 1-1 Cove Rangers
Spartans 0-0 Inverness CT
Scott Stewart
The visitors find their third equaliser of the day as Scott Stewart finishes from a corner kick.
Livingston 1-1 St Mirren
A third big chance for Dan Nlundulu since coming on as a substitute.
The St Mirren striker is on the six-yard line but fails to connect properly and his scuffed effort is blocked.
This looks destined for penalties.
Livingston 1-1 St Mirren
Half-time in extra time. The chances have dried up after a pulsating 90 minutes
FT: Dundee United 2-0 Ayr United
FT Kilmarnock 1-2 Dundee
Martin Dowden
BBC Sport Scotland at Rugby Park
Little argument about who deserved this but the manner of defeat will really hurt Kilmarnock.
The calamity between Kelle Roos and Robbie Deas was inexplicable, simply gifting Drey Wright the winner. It's rare to see an error so basic and costly.
Dundee were the better side, no doubt, and are really finding form with four wins from their last five.
Back to the drawing board for Neil McCann with Kilmarnock's winless run now at 16.
A reminder of the extra-time scores...
Livingston 1-1 St Mirren
Airdrieonians 3-2 Arbroath
Kelty Hearts 1-1 Cove Rangers
Spartans 0-0 Inverness CT
A shootout or two to come?
FT: Dundee United 2-0 Ayr United
FT: Kilmarnock 1-2 Dundee
Manager: Gary Naysmith
Formation: 5 - 3 - 2
Manager: Ian Murray
Formation: 4 - 2 - 3 - 1
Manager: Gary Naysmith
Formation: 5 - 3 - 2
Manager: Ian Murray
Formation: 4 - 2 - 3 - 1
Scottish Cup
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