You can keep up to date with Aberdeen, Hearts, Motherwell and St Mirren on our dedicated Premiership pages.

Hearts fans, you'll get reaction from your manager on your page when we get it later.

In the meantime, make sure you catch up with our match reports from each of today's ties:

• Greenock Morton 0-3 Aberdeen
• Partick Thistle 2-0 Ayr Utd
• St Johnstone 0-1 Motherwell
• St Mirren 1-1 Hearts (5-4 pens)

The action isn't over. We're providing radio commentary and live text coverage of Rangers' meeting with Alloa here.

The quarter-final draw will take place after that game.

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That was quick. Rangers are back in front against Alloa at Ibrox.

Another wee reminder that you can follow coverage for that one here.

St Mirren manager Stephen Robinson tells BBC Scotland: "If you're gonna win it, that's the way to win it. We were very comfortable in the first half, should've been more up.

"We defended really well when we needed to. What a way to win, a wee bit of luck at last in the cup and hopefully a decent draw.

"We pressed properly today, the way we always press. Hearts have got millions of pounds beyond our wildest dreams, but we've got charatcer, we've got quality.

"I don't think I have my best team on the pitch yet, but overall delighted with the character they showed."

Image source, SNS

Oh wow, Alloa have levelled against Rangers.

A reminder that you can follow coverage for that one here.

Motherwell manager Jens Berthel Askou tells BBC Scotland: "You need to score more goals than the opposition to earn the win, and we did that at the end.

"One of the last messages I gave the players before we went out is that we don't expect goals to come easy, sometimes you have to work really hard, sometimes you have to miss lots of chances or opportunities or crosses to get there.

"It's about never giving up... and I think we were excellent at that.

"And then obviously it's a big credit to St Johnstone, I think they played a very good game, made it really, really difficult for us to win.

"We had to use every calorie in the body to get there, which is exactly what some of our players need, because we haven't dared to push them that far over the limit in the pre-season, because we've had a thin squad with many games, midweek games as well.

"So it's excellent we got a game like this where we were pushed to the limit, and I think the boys did fantastic."

Image source, SNS

A love strike from Nedim Bajrami has put Rangers one up against third-tier Alloa.

You can follow coverage for that one here.

Derek McInnes made it clear on Wednesday that he is targeting silverware in his first season with Hearts.

"There's not one player who should have signed for Hearts without having that aspiration to win a trophy here," he said.

They might still achieve that this campaign, but at the first attempt in the first cup competition of the season, they are out before the quarters.

Image source, SNS

• Aberdeen
• Alloa or Rangers
• Celtic
• Kilmarnock or Dundee Utd
• Livingston or Hibernian
• Motherwell
• Partick Thistle
• St Mirren

What a way for Stephen Robinson to celebrate his new St Mirren contract.

What a job he's done in Paisley. A cup run is something he will be desperate for after three top-six finishes, and into the quarters his team go.

Malik Dijksteel scores! Hearts are out.

A 100% penalty record from St Mirren.

Beni Baningime scores for Hearts.

If St Mirren net with their fifth penalty, they win...

Here comes 17-year-old Evan Mooney.

Pressure? What pressure? He smashes into the top-left corner.

Alan Forrest scores to put the pressure back on St Mirren.

Advantage St Mirren!

Roland Idowu scores via a kiss off the crossbar.

Claudio Braga misses!

It's a good height for Shamal George and he goes the right way and saves.

Marcus Fraser scores for the hosts.

A 100% record so far.

Stephen Kingsley sends Shamal George the wrong way.

Hearts' lead restored.

Richard King squeezes in St Mirren's first penalty.

Should Zander Clark have saved that? Hmm...

Lawrence Shankland, shooting into the Hearts fans, scores the first spot kick.

Hearts go one up.