British welterweight champion Kell Brook needed just two minutes to defend his title against former champion Kevin McIntyre at Glasgow's Kelvin Hall.
McIntyre was stripped of the belt earlier this year for being unable to fight Brook because of a back injury.
Brook said he could not consider himself the real champion until he had beaten the previous holder of the belt.
That happened when McIntyre lost on a technical knockout after being floored three times in quick succession.
"I'm the genuine champion," said the 22-year-old Englishman afterwards.
"I took on who they said was the man and I have taken him out in style. So now I am the man.
"I was 100% confident. I said I knew it was going to be a hard fight and it could go 12 rounds.
"In the back of my mind I thought I would eventually get him, just not as early."
There was a much better outcome for the home fans when Ricky Burns retained his Commonwealth super-featherweight title with a seventh-round stoppage of Yakubu Amidu.
Burns controlled the early stages despite suffering a cut eye in the first round when he appeared to be caught by his opponent's head.
The Ghanian fought back well but Burns always had the edge and stunned his opponent in the dying seconds of the seventh round, forcing the referee to step in.
Burns believes the emphatic victory in Glasgow has boosted his credentials of a challenge for the WBO title, which champion Nicky Cook defends next month against Steve Foster Jr.
The 25-year-old said: "I wanted to get a big win and put on a good show for the fans in Scotland. But also to push my name up there for a fight with the winner of Cook-Foster.
"I think with that performance I have. There was a lot of talk that I have no power but I've proved I have."