There’s no denying Floyd Mayweather is one of the greatest fighters to ever step inside a boxing ring.

The American’s incredible 50-0 record speaks for itself, but one man who isn’t a fan of 'Money' is 50 Cent.

The pair were once close friends and even ran a business together, but have had beef since falling out in 2012.

Now, the rapper regularly trolls Mayweather on social media. Twitter user @MMAEejit shared one of his most savage jibes, where he claimed he would donate $750,000 to charity if Mayweather could read one full page of a Harry Potter book.

50 Cent claims he wasn’t paid what he was owed from their business – TMT Promotions – which he looked after while Mayweather was behind bars.

However, Mayweather says he has no issues with his former friend and doesn’t know why their feud began.

It’s been an interesting week for 'Money', whose unbeaten streak appeared to be beaten by Thai fighter Wanheng Menayothin at the weekend.

The ‘Dwarf Giant’ – who boasts a remarkable 54-0 record - announced on Sunday he would be stepping away from the ring.

He wrote on his Facebook page: “I have decided that it’s good to stop boxing. I know how I am. No one knows my body as much as I do.

“I stop boxing like this. Everyone needs money. But I would like to heal my body. Congratulations to all who support me. Thank you for all the strength you have always given me.”

However, the fighter has now U-turned on his decision to retire and is set to defend his WBC world title in the coming months.