Britain's Dereck Chisora won the vacant European heavyweight title with a fifth-round stoppage of Germany's Edmund Gerber at London's Copper Box.
The 29-year-old, who harbours hopes of another world title shot, drew blood from Gerber in the third round.
A series of combination shots cornered Gerber in the fifth, prompting the referee to end the contest.
Elsewhere on the card, Frankie Gavin retained his British and Commonwealth titles against David Barnes.
“My mum told me to either do it seriously or stop, so now I'm going to do this seriously”
Chisora, nicknamed 'Del Boy', lost to David Haye last year, but responded with stoppages of Argentina's Hector Alfredo Avila and
American Malik Scott
to re-launch his career.
He enjoyed the early momentum against his 17st rival, claiming the first three rounds, before weathering a fightback in the fourth.
On the resumption Chisora assumed control and caught his bigger opponent on the jaw before following up with a sustained flurry of blows to prompt the stoppage.
"I've been training every day," said Chisora, who now has 18 wins and four losses.
"I told my team I'm going to give myself three years in this game, training every day.
"I've woken up. My mum told me to either do it seriously or stop. So now I'm going to do this seriously."
The win could pave the way for a fight with the winner of the
postponed Haye v Tyson Fury bout,
or a world title match with Wladimir or Vitali Klitschko.
After watching his fighter claim the European title, Chisora's promoter Frank Warren raised the prospect of a fight with Fury in December.
Meanwhile, at the Liverpool Olympia
delivered a devastating body shot to Curtis Woodhouse to force a fourth-round stoppage and retain his Commonwealth light-welterweight title.
won by unanimous decision against Erick Ochieng to claim the vacant British light-middleweight title.
Smith's win means his family becomes the first to hold three British titles at the same time, with brothers Paul and Stephen holding belts at super-middleweight and super-featherweight respectively.
Billy Joe Saunders
beat John Ryder in their British middleweight title clash at the Copper Box Arena on the site of the London 2012 Olympics.
The 24-year-old from Hertfordshire won a unanimous points decision 115-113, 115-113, 115-114.
Saunders also keeps hold of his Commonwealth belt, ending Ryder's unbeaten record in the process.