The 10 men hold on to reach the last 16.

We are going into extra-time at Rugby Park.

There were first half goals from Dundee United's Marc McNulty and Kilmarnock's Rory McKenzie.

Since then, Kilmarnock have had the bulk of the chances, though Dundee United have finished the 90 minutes the stronger of the two.

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The Scottish Cup holders are going into an additional half hout after yet another game without scoring in 90 minutes.

A routine win for Aberdeen, thanks to first-half goals from Ryan Hedges and Christian Ramirez, plus a late header from Lewis Ferguson.

Edinburgh City managed just one shot all afternoon. A tough shift for the League 2 outfit.

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St Mirren ease into the last 16 of the Scottish Cup as goals from Kyle McAllister and Greg Kiltie defeat second-tier hosts Ayr United.

The damage was done for Ayr in the first half as McAllister marked his return to the Premiership side's starting XI by heading the opener after only seven minutes following a bright Ayr start.

In-form Kiltie fired the second before the break after being set up by midfield colleague Jay Henderson.

If you are Kelty fan, you're watching this through the cracks in your fingers because St Johnstone are piling the pressure on.

But in truth, the Premiership visitors are creating next to nothing with the ball.

It's a sobering state of affairs for the cup holders.

Jack Hamilton is the hat-trick hero for the Championship leaders.

Kevin van Veen is through one-on-one and bearing down on goal.

Once again Morton goalkeeper Jack Hamilton keep the ball out as he has been doing all afternoon.

Midfielder Jacob Butterfield has looked most likely to grab a goal for St Johnstone as he drills a shot from a tight angle over the top-right corner.

Extra-time is looming.

Dundee United's day so far is summed up by Charlie Mulgrew. He stands over a free-kick in front of an expected visiting support, but it tamely hits the wall and is cleared.

But they have another chance when good passing play opens up the chance for Ilmari Niskanen, who cracks a low shot off the outside of the post.

Are Kilmarnock going to be made to pay for those missed chances?

Motherwell midfielder Liam Donnelly gathers the ball 25-yards from goal and has acres of space to stride into.

His shot is always rising and narrowly flashes over the bar.

Oh dear.

Funso Ojo drives to the by-line and tees up Jay Emmanuel-Thomas, who has the whole goal to aim at from 10 yards, and hits the ball against the bar.

Celtic defender Christopher Jullien is on the bench after over a year out.

Kelty have a lease of life and suddenly St Johnstone are doing the defending.

They couldn't, could they?

Teddy Jenks volleys over from Funso Ojo's cross moments after a bit of a scramble in the Edinburgh City box.

Aberdeen have been pretty meek in the final third in the second half, while being under zero pressure up the other end.

Still no shot for the visitors.

Another good pair of chances for Kilmarnock. Blair Alston flashes a shot that Benjamin Siegrist has to punch wide for a corner.

Then Ash Taylor is again a threat from the set piece, this time heading wide.