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Benetton hammer Dragons in 10-try victory out in Italy.
Benetton score five first-half tries in a dominant 40 minutes for the Italian side - Jacob Umaga's fifth the pick of the bunch.
Dragons squander opportunities but do score one first-half try of their own through Oli Burrows.
Benetton score another five tries after the break, notching up over 65 points, while Rio Dyer and Shane Lewis-Hughes offer some Dragons resistance.
Cardiff Rugby secure bonus-point win over Racing 92 earlier on Saturday.
Tom Bowen scores the first try of the game to give Cardiff the lead, but Selestino Ravutaumada immediately hits back for Racing.
Geronimo Prisciantelli scores the visitors' second try to extend their lead before Rory Thornton crashes over on the stroke of half time to reduce the deficit to one point.
Keiron Assiratti scores the first try of the second half to put Cardiff six points ahead.
Cardiff rewarded for their pressure with a bonus-point try late on, scored by Ben Thomas.
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Cardiff 7-8 Racing 92
Cardiff with a 50:22 from... loose-head prop Rhys Barratt!
Taine Basham rips a ball away from Racing and the front rower earns a terrific attacking opportunity.
Wasn't quite as graceful as Callum Sheedy's dink through earlier but it was effective...
Cardiff 7-8 Racing 92
That's a poor miss by Geronimo Prisciantelli after Cardiff are penalised for being offside.
The Argentina back, lining up at 15 today, goes for goal from the middle of the pitch, 30 or so metres out, but it's wide.
Cardiff 7-8 Racing 92
A blow for the visitors after Jordan Joseph went down when attempting to charge down a box-kick.
The lock hobbles off and Lekima Tagitagivalu - another huge man - comes on.
Cardiff 7-8 Racing 92
Close to a second for Bowen and it's wonderful defence by Racing fly-half Gibert.
The Cardiff wing hacks a loose ball on and races down the left but Gibert matches him and forces another kick, which goes dead.
Alun Lawrence is back on for the Blue and Blacks after passing his HIA.
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Cardiff 7-8 Racing 92
James Hook
Former Wales fly-half on BBC Radio Wales
There’s a hint of a forward pass but it was really good attack play with a lot of decoy runners.
You can hear the crowd aren’t happy.
Ravutaumada try
Fresh from his yellow card, Selestino Ravutaumada finishes off a cracking move.
Gibert puts the ball out to the right wing - it's deemed to have been flat - and the Fijian wing combines with number eight Hacjivah Dayimani to go over.
The pass drifted forward but the officials are happy, clearly thinking that it was initially back.
This has been a very lively start in the Welsh capital.
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If Cardiff really turn up and play well, we'll have a serious game on our hands. Only if. If they don't, Racing will punish them.
Ayo, England
Cardiff 7-3 Racing 92
James Hook
Former Wales fly-half on BBC Radio Wales
Bowen has a series knack of scoring tries at the Arms Park at the moment.
It was an intelligent kick by Sheedy and then there is the pace of Tom Bowen, with a lovely pick up and lovely execution.
Bowen try, Sheedy con
Great response by Cardiff.
Callum Sheedy dinks a grubber past the Racing defence - which is missing Ravutaumada on their right flank - and livewire wing Tom Bowen wins the race to the ball.
Terrific finish and it's matched by Sheedy's conversion from the left touchline.
Image source, Huw Evans Picture AgencyGibert pen
Racing attack impressively and Cardiff are penalised for not rolling away.
The Parisians opt to go for goal - and take time off the sin bin - with Antoine Gibert bisecting the posts.
Good start by Racing after that yellow card.
Cardiff 0-0 Racing 92
James Botham is on for Cardiff while Alun Lawrence has a head injury assessment.
Cardiff looking to move Racing's big units around and make the most of their numerical advantage in these early stages.
Remember, the Blue and Blacks failed to make the most of Scarlets indiscipline in an Arms Park loss before Christmas.
Cardiff 0-0 Racing 92
Drama straight from the kick-off.
Cardiff number eight Alun Lawrence drops the kick-off and is then clattered high by Racing wing Selestino Ravutaumada.
It's head on head contact but Lawrence is deemed to have dropped his body height.
It's a penalty and a yellow card for the Fijian.
Cardiff 0-0 Racing 92
Referee Sara Cox blows her whistle and Antoine Gibert gets this game under way.
Cardiff, in pink, are playing towards the River Taff in the first half.
Cardiff v Racing 92 (15:15 GMT)
Image source, Huw Evans Picture AgencyLegendary Wales number eight Taulupe Faletau has suffered yet another injury blow for Cardiff.
He scored against Ospreys on New Year's Day but is set to be sidelined for several weeks with a calf problem, which means he is a serious doubt for the start of the Six Nations.
Sadly, Cardiff have got used to being without Faletau.
Alun Lawrence starts this afternoon and will look to continue an impressive season.
The dependable back-rower tops the URC for carries (136) and tackles made (129).
Lawrence is wonderfully unflashy and if Cardiff need some stardust then Taine Basham could provide it.
The flanker has not played since the round one defeat at Stade Francais and needs to grasp his chance after Dan Thomas' impressive performances.
Basham, who signed from Dragons last summer, is an explosive ball carrier and will look to make a big impact.
Cardiff v Racing 92 (15:15 GMT)
Image source, Huw Evans Picture AgencyCardiff flanker Alex Mann says today's game is the "perfect" opportunity to put festive defeats to Scarlets and Ospreys behind them.
Cardiff are still in a strong position for the URC play-offs but it was a missed opportunity to push towards the top four and home advantage.
"Nothing is ever going to go the way we want all of the time, it's how we react to that now," said Mann.
"That's the biggest challenge for us and there's nothing better than having Racing here on a Saturday afternoon.
"They're a historic club with some excellent players, so it's perfect for us to go out and show what we can do.
"These occasions at the Arms Park are the ones you want to play in, it's nothing but excitement from us."
Cardiff v Racing 92 (15:15 GMT)
The Challenge Cup features 18 sides split into three groups, with the top four progressing to the last 16.
This is the second game of the weekend in Pool Three after Stade Francais beat Exeter 27-25 in an absolute cracker in Paris.
The Chiefs went 22-0 up, then the Parisians came back to lead 24-22, Henry Slade struck a drop goal to make it 25-22 in the closing stages only for Leo Barre to respond with a penalty in the 76th minute.
Stade Francais claimed five points, Exeter just the one.
Cardiff sit fourth in the table and have a two-point lead over Racing 92.
That means a victory would, unless the French side claim a pair of bonuses, put them on the brink of qualification.
An Ulster win against Cheetahs in the Netherlands tomorrow would secure a last-16 spot for Cardiff with a round to spare.
However, the Blue and Blacks would still head to Exeter with home advantage to play for.
But we're getting ahead of ourselves, let's just see how things unfold over the next few hours.
Cardiff v Racing 92 (15:15 GMT)
Image source, Huw Evans Picture AgencyCardiff won the Challenge Cup in 2010 when they beat a star-studded Toulon and in 2018 they won a thriller against Gloucester to lift the trophy for the second time.
That classic was in Bilbao, which will host both finals again on 22 and 23 May.
Cardiff would love to go back to the San Mames Stadium for a bid to earn a hat-trick of titles in the second-tier tournament.
"There’s some history there, with the finals being held in Bilbao and what we’ve done in the past, so that’s in the background," said coach Corniel van Zyl.“But Europe always has a different flavour compared to the URC. It puts you in a different mindset and allows us to focus on ourselves rather than the other regions, which is refreshing."
Cardiff can not afford to slip up this afternoon to leave themselves with work to do in Exeter next weekend.
Cardiff v Racing 92 (15:15 GMT)
James Hook
Former Wales fly-half on BBC Radio Wales
How nice it is to have a nice Saturday afternoon kick-off.
Racing have a huge pack, they’ve made some changes and it’s interesting to see French’s approach to a European cup, and it’s the same story of which French team will turn up today?
Cardiff v Racing 92 (15:15 GMT)
Image source, Huw Evans Picture AgencyCardiff have rung the changes from the URC derbies and among those who return is wing Tom Bowen.
Arguably he was harshly overlooked in the festive period after a superb start to the season, although in fairness he is up against Josh Adams and Mason Grady.
The Wales Under-20s speedster crossed for five tries in the first block of the URC, including a hat-trick at Munster, and also scored in the dramatic win against Ulster.
Cardiff will look for Bowen, who had been set to play in the SRC last weekend only for a game at Aberavon to be postponed, and his fast feet to cause Racing problems.
The same applies for fit-again wing Iwan Stephens, who also possesses serious pace.
