Floyd Mayweather retires again after bettering Rocky Marciano`s record

Mayweather will now head into what he says is a permanent retirement with a perfect 50-0 record, one better than heavyweight legend Marciano.

Nevada: Floyd Mayweather outclassed Conor McGregor with a 10th-round stoppage here Saturday to win their money-spinning superfight and clinch his 50th straight victory.

Former welterweight boxing champion Mayweather, who had emerged from a two-year retirement to take on the Irish mixed martial arts star, took his time to get going before dominating.

The end came with a tired McGregor doubled over on the ropes as Mayweather landed two hard left hooks, prompting referee Robert Byrd to intervene and declare a technical knockout.

Mayweather will now head into what he says is a permanent retirement with a perfect 50-0 record, one better than heavyweight legend Rocky Marciano.

The American is also expected to be around $200 million wealthier, taking his career earnings to around $1 billion.

McGregor, who was an unemployed former plumber four years ago before emerging as one of the biggest stars of the Ultimate Fighting Championship, is expected to earn around $100 million.