So, so close for Ali Crawford!

The referee waves play on following a shoulder barge and St Johnstone almost take full advantage. Melker Hallberg gets into the box and cuts it back to Crawford, who smacks a shot off the underside of the bar before it's cleared.

As close as you're going to get without scoring.

Lewis Ferguson is absolutely adamant he should have won a spot-kick for the away side.

From a Dons corner, Ferguson makes a run across the front post and appears to be pulled down by Nicky Devlin before he can meet the ball with his head.

After a good spell of pressure from St Mirren, the space opens up for Richard Tait to let fly from around 25 yards out.

His low, curling effort has Kevin Dabrowski scrambling but it drifts just wide.

A Ross County free-kick leads to a bit of a goalmouth scramble, and Dudnee goalkeeper Adam Legzdins has to block on the line.

It has been all Aberdeen since they fell behind but they're yet to create a clear-cut opportunity.

A few slack passes have let them down when they are on the edge of Livi's box.

Kenny Crawford
BBC Sport Scotland at McDiarmid Park

Really good atmosphere here. The home fans are in excellent voice, realising the part they have to play in helping their team up the league.

Dundee United have brought the best part of 2,000 supporters to Perth and they’re making themselves heard, too.

Chris Mueller jinks his way into the box and Joe Shaughnessy goes to ground.

Initially it looks like he caught the American forward but replays show the St Mirren defender got a touch to the ball first.

We finally have our first real shot on goal at McDiarmid Park. United move the ball around well, progressing up the pitch, before Peter Pawlett's deflected effort goes behind.

The resulting corner bounces around but is ultimately headed behind.

A strong challenge from Demetri Mitchell causes a stern reaction from the St Mirren players, Jay Henderson even gives him a nudge as he gets up.

Referee Greg Aitken calms everyone down before showing Mitchell a yellow card. Probably the right decision.

What a challenge from Regan Charles-Cook of all people to deny Vontae Daley-Campbell just as he was about to pull the trigger from the edge of the six-yard box.

The County striker matched the run of the Dundee man and slid in with an inch-perfect challenge, and even managed to avoid conceding a corner.

Kevin Nisbet releases Demetri Mitchell down the left but his cross is cut out well by Richard Tait.

Up the other end a long period of possession for St Mirren ends with Jordan Jones crossing in from the left. Alex Greive lurches back but can't quite make meaningful contact.

Both sides up for this one so far.

It's been a really good game so far, plenty of action already.

Dundee's Max Anderson has a shot from inside the box that deflects for a corner. From that, the ball appears to hit the arm of Ross County's Jordan White but the appeals for a penalty are ignored.