Calzaghe's career was nothing short of spectacular. He claimed the WBO super middleweight title in 1997 with a unanimous decision victory over Chris Eubank. That win kicked off a championship reign lasting over a decade, during which he defended his title 21 times.
In 2006, Calzaghe put on a career-defining performance against Jeff Lacy, unifying the WBO and IBF belts. He capped off his career with impressive light heavyweight victories over Bernard Hopkins in Las Vegas and Roy Jones Jr. in 2008.
The slick southpaw retired undefeated with a perfect 46-0 record, including 32 knockouts. His high punch volume and ring intelligence made him a formidable opponent throughout his career.
When first asked about a comeback by Boxing News, Calzaghe said there was "no chance." But he's since changed his tune when it comes to facing Jake Paul, the self-proclaimed 'face of boxing' from Cleveland, Ohio.
"Would I get in the ring with Jake Paul? Let's say for £10 million. That would keep me happy. As long as I don't have to make weight for the fight, give me about four or five months' training and I'll be good!"
Paul, 28, has mostly faced retired MMA fighters in his boxing career. He suffered his first loss against Tommy Fury and recently took part in a controversial eight-round bout with Mike Tyson. Paul's next fight is rumored to be against former middleweight world champion Julio Cesar Chavez Jr.
Calzaghe isn't the only retired boxer willing to step into the ring with Paul. Carl Froch has also expressed interest, though that call-out has gone unanswered so far.
While a fight between Calzaghe and Paul remains unlikely, it's clear that the right offer could tempt even the most settled of retired champions back into the ring. For now, fans can only speculate about how the Welsh wizard's flawless career might have continued had he not hung up his gloves in 2008.