By Edward Chaykovsky

Retired former five division world champion Floyd Mayweather Jr. (49-0, 26KOs) believes IBO/WBA/WBC/IBF middleweight champion Gennady 'GGG' Golovkin (36-0, 33KOs) should take a risk - by moving up in weight to take a dangerous fight - like his most recent opponent, IBF welterweight champion Kell Brook (36-1, 25KOs).

Brook, who fights at 147-pounds, moved up by thirteen pounds to challenge Golovkin at the middleweight limit of 160.

Mayweather, who held the WBC/WBA world titles at welterweight and junior middleweight when he walked away, retired last September after dominating Andre Berto. Since his retirement, he's been very vocal when it comes to Golovkin and what he claims is preferential treatment being given to the dangerous puncher from HBO and the media. 

Brook put in a solid effort against Golovkin. He was landing some very solid punches and had the sold out O2 Arena in London on their feet in the second and third rounds.

He was eventually stopped during the fifth round. Brook suffered a broken right eye socket in the second round and had trouble with his vision. His trainer Dominic Ingle threw in towel when he saw his fighter was in trouble.

Mayweather had Brook ahead on points at the time of the stoppage - and he believes the fight should have been allowed to continue. If Mayweather was working Brook's corner, no towel would have been issued.

"If I was in Kell Brook's corner, I wouldn't have stopped the fight… honestly," Mayweather told Fighthype.com. "Very, very close fight, some had Triple G ahead, some had Kell Brook ahead. I probably had Kell Brook ahead a little bit.

"But in the sport of boxing, it's about taking risks. I respect Kell Brook for taking a risk, going up two weight classes, now we're waiting for Triple G to go up and take risks like every other champion."