That's it for our coverage of this play-off semi-final - but we'll do it all again on Wednesday as the two teams meet in the second leg at Elland Road.

If you've missed anything - or want more on that controversial penalty call, then check out the match report below.

As it is, Kemar Roofe has given Leeds a slender advantage over Derby.

That's it for now, but don't forget the play-off action continues this evening as Sunderland host Portsmouth in League One.

Image source, Rex Features

Here's Jack Harrison on THAT penalty call...

MTQ: Don't understand why that would ever be a penalty. Harrison had no intention of fouling Bogle. If you stick your leg in front of someone who is trying to kick the ball, that can't be a penalty. Also, disagree with a free kick to Leeds.

Steven Patrick McNamara: Leeds should be out of sight. Bossed the game from start to finish, the world and his wife want Derby to win as well

Craig Ramage
Former Derby midfielder on BBC Radio Derby

Leeds really dominated the ball and it was only in the last 10-15 minutes that there was a spark for Derby but they never really looked like scoring.

I'm disappointed with the way Derby played - they are better than that.

Image source, Rex Features

Kemar Roofe's second-half strike gives Leeds a slender lead into the second leg of the tie.

But a major talking point will be the reward of a penalty to Derby, a decision which was then reversed.

Leeds have the ball where they want it, down the right by the cornerflag.

Time is almost up.

Leeds survive another Rams onslaught as Kalvin Phillips heads away a corner.

The midfielder has been brilliant today, popping up with some crucial interceptions.

Kiko Casilla comes a long way out of goal to clear the ball and the Leeds keeper shanks it high into the air.

The ball eventually drops to Mason Mount, who ambitiously tries to volley goalwards from inside the centre-circle.

He doesn't catch it cleanly and Casilla gathers.

Derby forward Mason Bennett has a cross blocked on the right-hand side.

Then Leeds win a free-kick.

Harry Wilson is not happy with that and is shaking his head.

Calm defending from Leeds gets the ball away in their own right-back position after Scott Malone threatened.

Jack Harrison has the ball just inside the Derby half but the support is not forthcoming.

We will have five minutes of added time.

Still plenty of time for drama... or for Derby to test Kiko Casilla.

Image source, Getty Images

Now Tom Huddlestone - barely on the pitch - gets yellow for a late challenge on Stuart Dallas.

The Derby man left an elbow in after the ball had gone.

There's a fair bit of needle in the game at the moment.

Mateusz Klich looks like he'll have a chance on the edge of the Derby are but in the end the opportunity fizzles out.

Fikayo Tomori is furious with the Leeds midfielder as he gets up.

Replays show Klich put his head towards the defender's chest.

Klich gets shown yellow, and looks like he has survived a sending-off.

Final change for Derby, as Tom Huddlestone comes on for Tom Lawrence.

Can the former England man make the difference with his quality on the ball?

SeriousFace: Leeds massively fortunate with that penalty decision. They've been the better team, but that was clear. Got to feel that Casilla pressured the assistant.

Image source, Reuters

Five minutes plus stoppages left.

Derby County have not had an effort on target. At home. In a play-off semi-final.

Derby are still probing as they search for an equaliser.

But the Rams are also feeling aggrieved after having that penalty decision reversed.

Can they get a leveller in the closing stages?

Jamie Shackleton tests Rams goalkeeper Kelle Roos with a snap-shot from the edge of the area.

The Dutchman parries to ball back to the right, and a Leeds man sends the rebound into the side-netting - although the flag is up for offside.

Another change for Leeds, as Jack Clarke comes on for Kemar Roofe up front.