Well, that was quite an evening. Ross County were unstoppable and put seven goals past Falkirk, St Johnstone were clinical in their finishing against Rangers, Inverness beat Livi, and Morton and Dundee United made it through after extra-time. We'll be publishing highlights of the Saints' win at Ibrox very soon. Thanks very much for your company. I hope you can click your way through to our pages tomorrow night for the last three third-round matches. Good night.
- St Johnstone, Ross County, ICT, Dundee Utd and Morton reach last eight
- FT aet: Dundee Utd 3-1 Dunfermline (Morris, Fraser, Spittal) (Paton)
- FT aet: Morton 3-2 Motherwell (Samuel 2, Tidser) (McDonald, Moult)
- FT: Livingston 0-2 Inverness CT (Storey, Devine)
- FT: Ross County 7-0 Falkirk (Boyce 3, De Vita, Franks, Graham, Holden)
More from Morton boss Jim Duffy
"The trouble (with the Motherwell fans behind the goal) was a disgrace. It has nothing to do with football. It spoils the occasion. It's a football match and nothing more than that."
Morton manager Jim Duffy
"It was a drama-filled Cup tie. To lose the late goal was a kick in the teeth but the players didn't feel sorry for themselves. It shows the players have ability and character. Anybody watching the game, you'd think the momentum would swing to Motherwell but that wasn't the case."
Dundee United manager Jackie McNamara
"I'm delighted. We made hard work of it but we got through in the end. We deserved to go through."
Inverness CT manager John Hughes
"That's us one game away from a semi-final. I hope the draw is kind to us. Livingston came at us but we stood up to it. We should have scored more goals. I am absolutely delighted for the boys and that is us unbeaten in four. All the best musicians and actors, when the stage opens they are at their best. We will only get better. Wins give us confidence."
Anonymous: "High time for change at Fir Park. Steven Craigan SOS."
Dave, Edinburgh: "Time up for Baraclough."
On Wednesday evening, Celtic host Raith Rovers, Hibernian take on Aberdeen and Kilmarnock play Hearts for quarter-final places.
To summarise, St Johnstone, Inverness CT, Ross County, Morton and Dundee United are through to the last eight.
Falkirk manager Peter Houston
"It was an embarrassing night. I have never seen the team so less committed to winning a football match. They had more desire to win the headers. The way we have lost, it is a disaster, but I don't want to take anything away from Ross County."
John Lloyd, Rosyth: "A performance to be proud of by the Pars when we have a threadbare defence."
Championship Ton hang on and are through to the last eight. They take a Premiership scalp!
What are the Ton doing to their fans? First, Motherwell's Scott McDonald scored with the last move in added time at the end of the normal time. Now, despite being 3-1 up, they let in Well again. What a nervy last few minutes of extra time. Could we have penalties yet?
From a corner, Louis Moult is the sharpest to the loose ball and he cracks in a late, late goal for the Steelmen.
Ross County manager Jim McIntyre
"Liam Boyce was fantastic getting three. He is a real handful. Brian Graham has got his first goal. It has been a fantastic night for us. We spoke before the game that there would be a shock somewhere, let's make sure it's not us. The boys were driven to get more goals. It was great to see them going in the net."
Morton are surely in the last eight of the League Cup. Bobby Barr sets up Michael Tidser and he slots home his first goal since returning to the Greenock club.
Mike The Edinburgh Arab: "Delighted for Jackie Mac. Saw Utd play Killie they were unlucky with great effort from a young team. Jackie needs to be supported."
Joe in Fife: "I thought Rangers fans should be encouraged for the future by their team. Some very talented young players - good foundations. They will only get better."
The referee re-started the game at Cappielow and we are now at half-time of the 30 minutes of extra-time.
Inverness manager John Hughes tells our reporter Charlie Mann that he was frustrated at his team's performance against Livi but, nevertheless, he is happy to be in the next round of the League Cup.
BBC Scotland reporter Chick Young
"The Motherwell fans are isolated in that west terracing. The trouble broke out before the second goal went in. The fans won't back off, the police are in among them. The players are all gathered around the centre circle. I don't know how this will affect the players. I think I saw some of the younger fans [spilling on to the pitch] trying to get away from the trouble. It's a dreadful state of affairs."
Uh-oh, the referee has, hopefully temporarily, stopped the match at Cappielow because the Motherwell fans have spilled on to the pitch after what appeared to be fighting among themselves.
Blair Spittal scores a cracking individual goal to give Dundee United an almost comfortable lead.
In the seventh minute of the first half of extra-time, Scott Fraser dashes towards the Pars goal and smacks a left-foot shot past Sean Murdoch.
Morton's Ross Forbes curls a lovely left-foot shot at goal and it takes a great save by Connor Ripley to tip the ball over the bar.
We're under way in extra-time at Cappielow and Tannadice.
Not Caley Thistle's best performance of the season so far but John Hughes will no doubt be pleased that his team are enjoying another cup run.
And there's half an hour of extra time to be played, too, at Tannadice.
Oh well, let's be having another 30 minutes of football from Greenock.
Would you believe it? Heart-breaking for the Ton fans as Motherwell sub Scott McDonald scores a goal in the final minute of added time. Extra time looks a certainty.
Murdoch gets the lightest of touches to divert Simon Murray's shot away from the Pars goal.
Three minutes of added time to be played at Tannadice.
Ross County join St Johnstone in Monday's Scottish League Cup quarter-final draw.
BBC Scotland reporter Chick Young
"I was pretty convinced that Motherwell were going to get an equaliser but Morton seem to have weathered the storm. The Morton fans are trying to urge their team over the line."
BBC Scotland reporter Brian McLauchlin
"This looks like it's heading towards extra-time and possibly penalties. Both sides missing excellent chances in the second half."
After a spell of Motherwell pressure, Morton break but visiting keeper Connor Ripley saves the day by keeping Michael Tidser's shot out. That would have sealed it for the Ton.
Rangers manager Mark Warburton
"Credit to the opposition. They game with a game plan and they got their rewards in the first half. We've been together since June 27th. It's 11 new players."