Mayweather-Maidana Rematch
WBC/WBA welterweight champion Floyd Mayweather Jr. (L) of the U.S. punches at Marcos Maidana of Argentina during their title fight at the MGM Grand Garden Arena in Las Vegas, Nevada September 13, 2014. REUTERS/Mark Hundley (UNITED STATES - Tags: SPORT BOXING) Reuters

With two professional fights in 2015 left to his six-fight contract with Showtime, unbeaten American boxer Floyd Mayweather Jr is bent on becoming a trainer, even as questions loom who would be Money May's opponent in his last two fights.

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Ahead of his official retirement, Mayweather has expressed interest in teaching Prince Jackson, the son of music icon Michael Jackson, how to box. He has also started to train best friend Justin Bieber the science and art of boxing.

But Mashable compared Bieber's training by Mayweather, the WBC welterweight title holder, to the author of the Theory of Relativity, Albert Einstein, tutoring a 6-year-old child how to do long division.

YouTube/Justin Bieber Videos 2.0

The Canadian singer himself had shared the above 36-second video on YouTube of snippets of his sparring session with his BFF-cum-trainer. The TV show Conan, however, released a parody of the training session, which has become viral on YouTube, garnering almost 250,000 hits in just three days.

YouTube/Team Coco

Levity aside, Mayweather's future as a boxing promoter could be at risk following the filing of a lawsuit by two amateur boxers featured in the All Access TV special that was a teaser to the Mayweather-Marcos Maidana rematch on Sept 13. That clip, which hinted that no-break fights running for half an hour was happening in Mayweather's gym, was the subject of an investigation by the Nevada State Athletic Commission which has the power to revoke Mayweather's promoter licence in the state.

The young boxers' lawsuit backs up the claim of Showtime who that Mayweather lied to the commission's probe that the no-break fight and another scene showing marijuana use in the mansion of Mayweather were staged for the sake of boosting pay-per-view buys to the Sept 13 rematch which Mayweather won.

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