And another Cardiff corner as they finish the half in the ascendancy....

Aden Flint wins the first ball in the air for Cardiff but it doesn't settle for a team-mate to get the second ball.

A foul conceded in the melee and Derby breathe again...

Corner for Cardiff after some more decent pressure.

Three minutes being added on by the officials at the end of this first half.

Here comes the Callum Paterson long throw again for Cardiff and it creates confusion in the Derby box.

Matt Clarke can't get enough of a head on it to clear and instead flicks it on to the back post where it nearly goes in for an own goal off Krystian Bielik.

Bounces behind off the post!

Ryan Howard: If that's a penalty to Cardiff, then I've no clue why Derby didn't get one too.

It's fair to say the Rams felt aggrieved by Darren England's decision...

Image source, Rex Features

Plenty of energy about this game now as we move towards half-time.

Robert Glatzel nearly gets around the back of the Derby defence down the right but Richard Keogh keeps pace with the German to shepherd it clear.

Lee Peltier in the book for Cardiff for a shove on Tom Lawrence moments after a couple of frantic bits of Derby defending as they overplay it a touch around their own box.

The Rams looking in danger of setting traps for themselves.

Cardiff with a decent move from a free-kick deep in Derby's half that finds its way to the head of Sean Morrison.

His nod back into the danger area can't find a team-mate and Derby get it clear.

Image source, PA Media

Tom Lawrence trying to mount the odd surging run through the Cardiff defence, but with little joy.

Cardiff looking well-organised in terms of defensive shape.

Image source, PA Media

Game losing its tempo despite Derby trying to string the odd move together.

Scott Malone goes looking for his second goal of the night with a volley from distance but it's straight at Alex Smithies who gathers easily.

Cardiff looking to go direct in search of another goal.

Callum Paterson and Richard Keogh will no doubt have a fair few aerial battles before this one is done.

Derby get it clear for now, but look out for more of the same to come.

Image source, Getty Images

Good work by Alex Smithies to pounce on a loose ball as Jack Marriott goes hunting for it in the Cardiff box.

Scott Malone's cross from the left took a deflection and was tricky for a moment but Smithies on to it in a flash to prevent Marriott picking up on the scraps.

Frustration continues for Derby as the game gets a bit patchy.

Krystian Bielik and Gavin Whyte collide in a 50/50 on the edge of Derby's box and the referee stops play for Whyte to get treatment just as the Rams looked like mounting a counter-attack.

Richard Keogh not short of a word or two.

Well, that's an eventful start.

Derby are still fuming that they didn't get a penalty of their own for a foul on Martyn Waghorn, but there could be few complaints for how Richard Keogh brought Robert Glatzel down.

Phillip Cocu looks very frustrated by how his side have thrown away their early lead.

But there will be a penalty at the other end to Cardiff!

Richard Keogh is booked for pulling at the shirt of Robert Glatzel who goes down and Darren England points to the spot.

Drama!

Image source, Getty Images

Derby think they should have a penalty here.

Martyn Waghorn goes down in the area as he tried to tangle clear of Joe Bennett, but nothing given.

Rams assistant Shay Given is also off the bench to remonstrate with the fourth official.

Was there a hint of handball in the build-up to that Derby goal?

Couple of television replays suggest that Martyn Waghorn may have used his right arm to help him bring the ball under control as it pinged around the box before Scott Malone tucked it home.

Meanwhile, Cardiff show some promise at the other end until Robert Glatzel is caught offside in the area.

Image source, PA Media

A surge forward from Josh Murphy down Cardiff's left comes to a halt on the edge of the Derby area Richard Keogh makes an important block.

That could be a key battle as this game develops and Cardiff search for a leveller.