Floyd Mayweather turns 42 in February but you wouldn’t bet against him coming out of retirement for one final mega-fight.

The American has already amassed a fortune from boxing - he’s one of only a handful of athletes to reach $1 billion in career earnings - but if there’s one thing he can’t resist it’s a big fat pay cheque.

Mayweather earned a cool $9 million on New Year’s Eve for a three-round fight with Japanese kickboxer Tenshin Nasukawa in Tokyo.

In truth, the exhibition bout was a complete farce. Mayweather turned up several hours late, spent most of the fight smiling and beat Nasukawa in just 140 seconds before performing a victory dance.

Nasukawa, the golden boy of MMA in Japan, was left in tears after suffering a third knockdown in the opening round. (He has since uploaded an emotional post to Instagram which you can read HERE.)

"I'm still undefeated; Tenshin is still undefeated. Tenshin is a true champion and a hell of a fighter,” Mayweather insisted after the fight, per BBC Sport.

Addressing the Japanese fighter, he added: "Hold your head up high.

"I want the fans around the world to support Tenshin, he's a great guy and a great champion."

Speculation over a potential fight with Khabib Nurmagomedov, or a rematch with Manny Pacquiao, will now intensify again for Mayweather following his effortless victory over Nasukawa.

Pacquiao is desperate for another shot at the former five-weight world champion after losing their big-money showdown back in May 2015.

First, though, the 40-year-old is focused on defeating Adrien Broner later this month.

Pacquiao couldn’t resist taking a dig at Mayweather on Twitter following his latest fight.

He posted: “Here is an early New Year's resolution. To continue to only fight experienced opponents who are my size or bigger.”

Ouch.

He also retweeted the following video…

Now, now, Manny.

Pacquiao has made his feelings clear with his Twitter activity. It’s obvious he feels the fight was a joke and that Mayweather should pick on boxers his own size.

It’s also obvious that Pacquiao is trying to goad Mayweather into arranging a rematch.

Would Pacquiao beat Mayweather in a rematch? Have your say below.