Nick David showing how dangerous he can be, coming in off his line and through tackles.

Cardiff scamper back and are deadly at the breakdown.

Only Toulouse and Begles-Bordeaux have made more clean line breaks than Quins.

Oh Quins had a golden chance there.

Danny Care was quick with the tap penalty but Andre Esterhuizen had white-line fever and knocks on.

Dafydd James
Former Lions and Wales back on BBC Radio Wales

That's exactly what Harlequins needed to get back in the game.

Great position in the corner and there was only one way that was going, up the jumper a full eight man shove which was ominous from the start before powering over.

Harlequins put in a great chase to the kick off and win a penalty deep inside the Cardiff half.

There;s a bit of afters between the forwards and the referee needs to have a word.

Quins centre Andre Esterhuizen penalised for taking opposite number Rey Lee-Lo off the ball and De Beer opens the scoring.

Tyrone Green drops the first high ball of the night to a huge cheer from the home fans.

Cardiff kick more than most teams so expect a lot of that tonight.

Frank Murphy blows his whistle and Marcus Smith gets us under way in the Welsh capital.

Dafydd James
Former Lions and Wales back on BBC Radio Wales

Cardiff probably should have come away with the spoils against a very competent Bath team and showed some very good skills and scored some fantastic tries.

On the other end of the coin is Harlequins with Marcus Smith, who likes to run, likes to throw the ball around so it all bodes well for a bumper crowd here today.

Image source, Getty Images

England fly-half Marcus Smith returns for his 150th Harlequins appearance.

Former Cardiff prop Dillon Lewis is named among the Harlequins replacements but another old Arms Park favourite Jarrod Evans is injured.

That is not the end of the links between the two clubs with Harlequins coaching staff members Danny Wilson, Billy Millard and Adam Jones all former coaches or players at Cardiff.

Scrum-half Danny Care will partner Smith in an all-changed Harlequins half-back pairing. Their only other change is in the second row where Joe Launchbury replaces Irne Herbst who drops to the bench.

Harlequins: Tyrone Green; Nick David, Oscar Beard, Andre Esterhuizen, Cameron Anderson; Marcus Smith, Danny Care; Fin Baxter, Jack Walker, Will Collier, Joe Launchbury, George Hammond, James Chisholm, Will Evans, Alex Dombrandt (capt).

Replacements: Nathan Jibulu, Jordan Els, Dillon Lewis, Irne Herbst, Chandler Cunningham-South, Will Porter, Lennox Anyanwu, Louis Lynagh.

Image source, Huw Evans Picture Agency

Wales flanker Thomas Young returns for Cardiff after recovering from a calf injury he suffered in November.

But Wales wing Josh Adams is still missing after picking up a leg injury.

Young is one of five Cardiff personnel changes from the side that lost to Ospreys with flanker Alex Mann and prop Rhys Carre starting.

Centre Willis Halaholo, who extended his contract this week to the end of the seasonm, and wing Harri Millard come into the backline.

James Botham switches to number eight from flanker.

Cardiff: Cam Winnett; Harri Millard, Rey Lee-Lo, Willis Halaholo, Mason Grady; Tinus de Beer, Tomos Williams; Rhys Carre, Liam Belcher (capt), Keiron Assiratti, Teddy Williams, Seb Davies, Alex Mann, Thomas Young, James Botham.

Replacements: Efan Daniel, Corey Domachowski, Rhys Litterick, Rory Thornton, Mackenzie Martin, Ellis Bevan, Ben Thomas, Owen Lane.

Image source, Huw Evans Picture Agency

Hello and welcome to a sold out Arms Park for this tasty Anglo-Welsh clash between Cardiff and Harlequins.

It's getting to that time when a win is a must for both sides.

Harlequins are fourth in Pool 2 having also been thrashed by Toulouse but retain hopes of progression having also won 31-28 in Paris.

Cardiff have also been heavily beaten by Toulouse before a narrow loss here to Bath.

So let's have a look at the teams.

A comprehensive victory for Leinster in Dublin sees them get back to winning ways and progress to the last 16 of the Champions Cup, although they have not yet secured home advantage in the knockout rounds.

They can do so next week when they face Leicester in their final group game next Saturday.

Now attention will turn to Cardiff who host Harlequins at 20:00 GMT.

Image source, Getty Images

It is all over at the Aviva and Leinster make it three wins from three in Pool 4 of the Champions Cup with a convincing win in Dublin.

After scoring three tries in the first half, a dominant display in the second period including four more tries helped them to a bonus-point win.

Joris Segonds scored a last gasp try for Stade Francais, who now exit the competition.

Image source, Getty Images

Credit to Stade Francais, they have not given up despite the heavy score line and are pushing hard for their first try of the game as the clock ticks into the red.

Stade Francais are so close to a try, but Ro Dakuwaqa touches down before the line and then loses control of the ball, resulting in a knock-on.