(CNN) -- Britain's undefeated world super-middleweight and light-heavyweight champion Joe Calzaghe has announced his retirement from boxing.
Undefeated Joe Calzaghe says his victory over Roy Jones Jnr was his last fight.
The 36-year-old Welshman, who outpointed Roy Jones Jnr in his last fight last November, is hanging up his gloves after winning all of his 46 professional bouts.
"It was a difficult decision but I have achieved everything I wanted to achieve in boxing," he told BBC Sport. "I've been world champion for 11 years. I've got no other goals to go for. That's why I am calling it a day."
Calzaghe climbed off the canvas after a first-round knock-down to maintain his unblemished record against Jones Jnr in New York.
That unanimous points decision saw him retain the light heavyweight title he won by beating Bernard Hopkins on a split decision last April.
Calzaghe had already confirmed his dominance of the super-middleweight division with victory over Mikkel Kessler in November 2007 when he unified the WBO, WBA and WBC belts.
He said "My decision is to retire. I've been boxing for 25 years and, like I said, I've achieved everything I want to achieve."
Calzaghe explained the reasons behind retirement saying: "I had a long think with my family. My children wanted me to give up, plus my mum. That's why I called it a day and will go on to do something else.
"There's loads of things I want to do. I'm proud to be one of only a few fighters in history to retire undefeated."