Floyd Mayweather Jr does not have the same passion for boxing that he once did, but insists he will get the job done in his mouth-watering bout against Manny Pacquiao.

The richest fight in boxing history is a little over two weeks away with Mayweather putting his perfect 47-0 record on the line against the Filipino at the MGM Grand in one of the most eagerly awaited fights of all time.

While boxing fans the world over gear up for the exciting showdown, Mayweather himself admits that at this stage of his career the sport has become more of a business for him.

"I don't enjoy it like I once did. It is at a point where it is business," he said at an open media workout. 

"It is my job. I go to the gym. I train. I know what I have to do. There was a time when it was fun but I am at a point now where I am really over all of that stuff."

Critics suggest that the welterweight showdown has come too late in the careers of both fighters.

But Mayweather, in typically confident manner rubbished that notion, stating that both men are doing battle in their prime.

"He's a future hall-of-famer. I am a future hall-of-famer and we are meeting at the pinnacle of our careers," he added.

"From the match-up, it is going to be a very exciting fight.

"Our styles are totally different. I fight with smarts. Every move is calculated. Every move is thought about."

On paper there appears little to choose between the two, but Mayweather stated that Pacquiao's "reckless" style will be his downfall, citing Juan Manuel Marquez's 2012 knockout victory over the 36-year-old as an example.

"He fought very, very recklessly in the Marquez fight," Mayweather said. "I could have had the same type of career but my career wouldn't have lasted this long."