Kal Yafai retains his WBA world super-flyweight title on points against Japan's Sho Ishida, with heavyweight Dillian Whyte beating Finland's Robert Helenius.
Then in the main event, Anthony Joshua, who suffered a broken nose in the second round, produced a dominant performance to finally stop brave challenger Carlos Takam in the 10th round to retain his WBA, IBF and IBO world titles.
Well he wants to unify the division, which means WBO champion Joseph Parker, who gained an unconvincing points win over Britain's Hughie Fury in September, is very much on the radar.
As is Deontay Wilder, who defends his WBC title against fellow American Bermane Stiverne next Sunday.
However, Joshua does not want to lose his WBA, IBF or IBO titles so we may next see him in the ring against a mandatory challenger to make sure he does not lose any gold.
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Joseph Lane: Great fight from Anthony Joshua, absolutely smashed it. Carlos Takam, absolute warrior.
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I want a rematch - Takam
Anthony Joshua beats Carlos Takam via 10th-round stoppage
Some quotes from the gallant challenger Carlos Takam, who is asked whether the referee was right to stop the fight.
"No, I don't think so," he says. "I don't know why the referee stopped the match. I respect the champion and the UK fans, they are great fans and I am happy to box here. I don't know why they stopped it.
"I want a rematch, I make my preparations with 12 days to fight Anthony. I want a rematch, I want to box him again, I want him, he is a great champion."
PACopyright: PA
'AJ will fight anyone'
Quotes from promoter Eddie Hearn: "AJ's told me he wants the belts. Deontay Wilder against Anthony Joshua has to happen.
"There's also a great heavyweight called Tyson Fury. Anthony Joshua will give you the fights you want. Wilder, Fury, Joseph Parker - they're the 2018 fights.
"I don't think we should go abroad. Anthony Joshua will fight anyone."
ReutersCopyright: Reuters
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Leonard Odicean: Well done. A good performance. I'm glad the fight was stopped before Takam got hurt. But I'm sure he was a bit sore already.
'It's a beautiful thing'
More from Anthony Joshua: "It's a beautiful thing, look what boxing is doing, people from different backgrounds, flying in from different countries."
'I don't make the decisions'
Here's Anthony Joshua talking in the ring: "First and foremost, Cardiff thank you for coming out this evening.
"Takam, it was a pleasure. I come to fight, I don't sit on the edge and make decisions. It was a good fight until the ref stopped it, so I have the utmost respect for Takam.
"I have no interest in what is going on with the officials, that's not my job. I think people want to see Takam unconscious on the floor, and that's what I was trying to get to."
On breaking his nose in the second round: "I had to keep my cool. I've got a few months to heal it up. I'll go and see some good doctors to crack it back in place.
"If I showed any signs of weakness, the ref could have jumped in. That's what he (Takam) tried to do, but the ref stopped it.
"I want to continue to grow the sport of boxing and everyone knows where we're heading."
Appreciation for the challenger
Michael Pearlman
BBC Wales Sport in Cardiff
Not many of the huge crowd in Cardiff even knew who Carlos Takam was a fortnight ago, but he's just received a terrific ovation from the Principality Stadium.
They know that was a great effort from the stand-in opponent, headbutt or not. Anthony Joshua is also showing his appreciation.
Takam 'deserved chance to stay in the fight'
Criticism keeps coming for the stoppage.
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Anthony Joshua retains his WBA, IBF and IBO world heavyweight titles as he attacks, but Takam was not throwing enough back and referee Phil Edwards has seen enough and stops it.
The fans are not happy and some booing is heard. Not for Joshua's performance, not for Takam's performance but at that decision to stop it.
ReutersCopyright: Reuters
Post update
Round 10: Anthony Joshua v Carlos Takam
Nine minutes left and Carlos Takam is still there. But for how much longer? He takes two big lefts.
Great courage from Takam
Round 9: Anthony Joshua v Carlos Takam
A crushing left hook to the head of Carlos Takam is not exactly what the challenger needs. But all credit to the granite-like challenger.
He takes the punch, stays on his feet and carries on. Great courage, great character, great bravery.
Takam takes it to Joshua
Round 9: Anthony Joshua v Carlos Takam
Carlos Takam still looks for the magical moment. A left hook followed by a right show that the challenger could still give the champion something to think about.
Live Reporting
Michael Emons and Alex Bysouth
All times stated are UK
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Katie Taylor won her first world title with a points win over Anahi Sanchez.
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Kal Yafai retains his WBA world super-flyweight title on points against Japan's Sho Ishida, with heavyweight Dillian Whyte beating Finland's Robert Helenius.
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Latest PostThanks and goodbye
And we are going to end our live page there.
Thank you for all your comments and for joining us.
Then in the main event, Anthony Joshua, who suffered a broken nose in the second round, produced a dominant performance to finally stop brave challenger Carlos Takam in the 10th round to retain his WBA, IBF and IBO world titles.
Until next time, bye for now.
Joshua stops Takam in 10th round
Anthony Joshua stopped a resilient Carlos Takam in the 10th round to successfully defend his IBF and WBA heavyweight world titles in Cardiff.
The Briton made it 20 victories from as many bouts in front of an estimated 78,000 at the Principality Stadium.
Joshua's nose was cut in the second by the head of Takam, 36, who replaced Kubrat Pulev 12 days before the bout.
Joshua, 28, then cut Takam's eye in the fourth, but it took until round 10 for the Cameroon-born boxer to be stopped.
'Joshua always putting on top perfomances'
Chris Eubank Jr has his say on the fight.
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Who next?
Where next for Anthony Joshua?
Well he wants to unify the division, which means WBO champion Joseph Parker, who gained an unconvincing points win over Britain's Hughie Fury in September, is very much on the radar.
As is Deontay Wilder, who defends his WBC title against fellow American Bermane Stiverne next Sunday.
However, Joshua does not want to lose his WBA, IBF or IBO titles so we may next see him in the ring against a mandatory challenger to make sure he does not lose any gold.
Get Involved
#bbcboxing
Joseph Lane: Great fight from Anthony Joshua, absolutely smashed it. Carlos Takam, absolute warrior.
I want a rematch - Takam
Anthony Joshua beats Carlos Takam via 10th-round stoppage
Some quotes from the gallant challenger Carlos Takam, who is asked whether the referee was right to stop the fight.
"No, I don't think so," he says. "I don't know why the referee stopped the match. I respect the champion and the UK fans, they are great fans and I am happy to box here. I don't know why they stopped it.
"I want a rematch, I make my preparations with 12 days to fight Anthony. I want a rematch, I want to box him again, I want him, he is a great champion."
'AJ will fight anyone'
Quotes from promoter Eddie Hearn: "AJ's told me he wants the belts. Deontay Wilder against Anthony Joshua has to happen.
"There's also a great heavyweight called Tyson Fury. Anthony Joshua will give you the fights you want. Wilder, Fury, Joseph Parker - they're the 2018 fights.
"I don't think we should go abroad. Anthony Joshua will fight anyone."
Get Involved
#bbcboxing
Leonard Odicean: Well done. A good performance. I'm glad the fight was stopped before Takam got hurt. But I'm sure he was a bit sore already.
'It's a beautiful thing'
More from Anthony Joshua: "It's a beautiful thing, look what boxing is doing, people from different backgrounds, flying in from different countries."
'I don't make the decisions'
Here's Anthony Joshua talking in the ring: "First and foremost, Cardiff thank you for coming out this evening.
"Takam, it was a pleasure. I come to fight, I don't sit on the edge and make decisions. It was a good fight until the ref stopped it, so I have the utmost respect for Takam.
"I have no interest in what is going on with the officials, that's not my job. I think people want to see Takam unconscious on the floor, and that's what I was trying to get to."
On breaking his nose in the second round: "I had to keep my cool. I've got a few months to heal it up. I'll go and see some good doctors to crack it back in place.
"If I showed any signs of weakness, the ref could have jumped in. That's what he (Takam) tried to do, but the ref stopped it.
"I want to continue to grow the sport of boxing and everyone knows where we're heading."
Appreciation for the challenger
Michael Pearlman
BBC Wales Sport in Cardiff
Not many of the huge crowd in Cardiff even knew who Carlos Takam was a fortnight ago, but he's just received a terrific ovation from the Principality Stadium.
They know that was a great effort from the stand-in opponent, headbutt or not. Anthony Joshua is also showing his appreciation.
Takam 'deserved chance to stay in the fight'
Criticism keeps coming for the stoppage.
App users may need to click 'view more' to see this post.
Post update
Anthony Joshua beats Carlos Takam via 10th-round stoppage
Anthony Joshua has now won all 20 of his professional fights inside the distance. He still has not gone past 11 rounds in any pro contest.
Post update
Anthony Joshua beats Carlos Takam via 10th-round stoppage
Post update
Anthony Joshua beats Carlos Takam via 10th-round stoppage
Carlos Takam is still unhappy with that stoppage. He thought he was still in the fight. Phil Edwards said otherwise.
'Terrible stoppage'
Some big names from the world of boxing are not happy with that stoppage.
BreakingJoshua wins via 10th-round stoppage
Anthony Joshua retains his WBA, IBF and IBO world heavyweight titles as he attacks, but Takam was not throwing enough back and referee Phil Edwards has seen enough and stops it.
The fans are not happy and some booing is heard. Not for Joshua's performance, not for Takam's performance but at that decision to stop it.
Post update
Round 10: Anthony Joshua v Carlos Takam
Nine minutes left and Carlos Takam is still there. But for how much longer? He takes two big lefts.
Great courage from Takam
Round 9: Anthony Joshua v Carlos Takam
A crushing left hook to the head of Carlos Takam is not exactly what the challenger needs. But all credit to the granite-like challenger.
He takes the punch, stays on his feet and carries on. Great courage, great character, great bravery.
Takam takes it to Joshua
Round 9: Anthony Joshua v Carlos Takam
Carlos Takam still looks for the magical moment. A left hook followed by a right show that the challenger could still give the champion something to think about.