Anthony Joshua became a further unified heavyweight champion of the world after outpointing Joseph Parker via a unanimous decision.
Scores after twelve rounds read 118-110, 118-110, 119-109.
It was the first time the Brit had gone the distance in his 21 fights as a professional, and in reality, it never looked in doubt.
AJ added the WBO strap alongside his WBA, IBF and IBO belts and just requires the Deontay Wilder’s WBC title to become undisputed champion.
The opening few rounds were a tactical affair but Joshua used his superior size to his advantage, landing the cleaner jabs and combinations.
The fight failed to catch fire, but referee Giuseppe Quartarone must take a majority of the blame. The heavyweights were never allowed to work each other on the inside which sent the contest into a snooze fest.
The obvious fight that everybody wants is a showdown between Joshua and Wilder. And when asked, ‘how do you beat Deontay Wilder?’ Joshua replied: “Get him in the ring and I’ll knock him spark out.
On the undercard, Alexander Povetkin broke the hearts of David Price and the Principality Stadium after delivering a savage couple of hooks to end proceedings.
Round three witnessed Price on the floor before the Liverpudlian bounced back to leave the Russian hanging on the ropes and take a standing eight count which saw Cardiff erupt.
But the fairytale wasn’t to be as Price appeared unconscious on the canvas in round five.
The medical team treated the courageous Brit immediately before the heavyweight was back up on his feet.
Povetkin will now be hoping to be the next in line to challenge the winner of Anthony Joshua and Joseph Parker.
Belfast bantamweight Ryan Burnett retained his WBA title, defeating mandatory challenger Yonfrez Parejo 120-108 120-108 116- 112.
The Adam Booth fighter never looked in doubt with his Venezuelan opponent often refusing to engage in any trade.
Burnett admitted he is open to a showdown against the winner of Naoya Inoue and Jamie McDonnell.
Further pictures by Lawrence Lustig
Joe Hewlett is lead writer for World Boxing News. Follow Joe on Twitter @Hewlett95