We'll wrap this up here, with Celtic and Kilmarnock opening the late start in lively fashion.

Here are the teams through to the fifth round of the Scottish Cup.

• Aberdeen
• Airdrieonians
• Ayr United

• Cove Rangers
• Dunfermline Athletic
• Hamilton Academical
• Hearts
• Hibernian
• Livingston
• Queen's Park
• St Johnstone
• St Mirren

Tomorrow, we have Falkirk v Raith Rovers and Rangers v Fraserburgh, with a Dundee derby to finish things off on Monday night.

St Johnstone manager Simo Valakari tells BBC Scotland: "It's a big win for the players, for the club and for the fans as well.

"The most important thing was to win the match and get to the next round but the first half performance was very good and in the second half we showed the character to defend.

"It has not been easy, there's no hiding but you cannot control the results. You can control the performances and I thought the players put in a good performance today.

"When we have lost matches we have been down but we've known what we needed to do. We can't stop doing the things we're good at. This gives us something to be happy about. We can't think we've turned a corner, that's the worst thing was can think.

"When we can play this way, we defend better as well. From that point on our game looks more complete. It's still very fragile. Overall I was very pleased."

Image source, SNS

Jimmy Thelin praised fourth-tier hosts Elgin but expressed relief that his Aberdeen side were able to end a 12-game run without being able to celebrate a win with their fans.

"We have been through a difficult time," the manager tells BBC Scotland. "With the crowd we had today, it was important everyone knew the importance of the game to us.

"Allan Hale [opposition manager] and Elgin had a lot of energy and had a good performance in the first half and pushed us a lot. It was a difficult game and all credit to them - they didn't give up.

"The first half was not strong and they were good. They were almost through our back line tow or three times and we can't give those kind of chances in this type of game.

"In the end, I saw some good things from our team also."

Thelin has previously expressed his desire to sign a new striker during January.

"At least we are creating chances," he adds.

Image source, SNS

Andrew Shinnie's late, late strike proves to be the winner in Dingwall.

This was a real battle. Plenty of meaty challenges, with 10 yellow cards dished out and chances at either end.

Ultimately, it was Livingston who would spare us all penalties as they caught Ross County on the counter.

Image source, SNS

The Spiders flirted with an upset at Hampden, but Zak Rudden found a stoppage-time equaliser and Josh Scott hit the winner in extra-time.

Hibernian manager David Gray tells BBC Scotland: "I'm happy, job done in terms of getting into the next round.

"Massive credit to Clydebank to keep going the way they did. It was a great day for them and their supporters, they supported their team right to the end and encouraged them to keep going.

"The message before the game was to try and maintain the standards we've set in recent weeks. We became a bit sloppy in the first half but the second half was miles better, much more like us.

"Everybody came through the game which was important. All in all a really good day's work.

"We're delighted to be in the hat, that's the main thing, we'll see who we get and go from there."

Image source, SNS

A long, curling County free-kick comes to Kacper Lopata and he sidefoots on the volley - but Jerome Prior is down well to make a brilliant save and tip round the post.

It's the hosts who are pressing.

They probably won't add to their tally this season, but Queen's Park remain third on the list of most successful clubs in this competition.

They lifted the Scottish Cup for the 10th time in 1893!

Meshack Ubochioma is also on for Livingston, and he's gone into the book for a high boot almost immediately.

The players are starting to look pretty tired out there.

Sincere apologies to Oli Shaw after we missed his 95th minute strike amid the flurry of final whistles...

It's from a breakaway, with the Musselburgh keeper up for a corner. Classic Scottish Cup fare...

That's 13 in all competitions for the former Hibs, Ross County and Kilmarnock striker.

Back under way, and David Martindale has finally rolled the dice. He's brought Andrew Shinnie on for Stevie May.

Feels like this one is heading to penalties...

Callum Davidson's side have been well on top after falling behind to the League One visitors.

The first half of extra-time comes to an end as Jamie Brandon launches a shot miles over the bar, over the stand, and out the ground.

Ross County made their fifth substitution just before, with Charlie Telfer coming on.

Still no changes for Livi.

Kheredine Idessane
BBC Scotland at McDiarmid Park

Some of the Motherwell fans around me were absolutely furious with what they've seen. They came in large numbers, making up at least half the crowd, but were let down by a poor showing from their injury-depleted side.

St Johnstone, on the other hand, are cock-a-hoop. Home boss Simo Valakari celebrated on the pitch at the end of a potentially big win. It's a first victory in 10 games and a place in the fifth round draw. Fully deserved.

Saints were good today, with Makenzie Kirk and new signing Victor Griffith causing Motherwell all sorts of problems. The 1-0 score probably flatters Motherwell. They huffed and puffed but rarely troubled home keeper Andy Fisher.

Is this the turning point Valakari was hoping for?

As we reach the 100th minute in Dingwall, Livingston boss David Martindale is yet to bring on a substitute.

Jane Lewis
BBC Sport Scotland at East End Park

This was a comfortable afternoon for the Pars, with new manager Michael Tidser in the dugout and new owners perhaps watching stateside.

Rarely troubled, the Championship side will take confidence from their display. They were good on the ball with some lovely link play between the midfield and out wide. Defensively, when called upon, they were solid.

They'll be hoping this result can be used as a springboard for the league. But right now they'll just be enjoying the fact that they're through to the next round of the Scottish Cup.

Caolan Boyd-Munce's late goal makes sure of St Mirren's spot in the Scottish Cup last 16.

Image source, SNS

A second game with 30 more minutes, thanks to a late leveller from Spiders' sub Zak Rudden.