'Ronda Rousey would throw Floyd Mayweather on his head... I'd knock him out cold' - Conor McGregor
The recent criticism of Floyd Mayweather shows no sign of abating after UFC stars Ronda Rousey and Conor McGregor declared open season by throwing down the gauntlet to the world's highest grossing sportsman.
Only a week ago Mayweather announced he would enter retirement with a whimper after confirming Andre Berto as his final opponent in Las Vegas on September 12. A victory would equal Rocky Marciano's hallowed mark of 49-0.
Berto has lost three of his last six fights and fallen to previous Mayweather victims Robert Guerrero and Victor Ortiz, so offers little more than protection to a record that is clearly destined to be padded out to a historical 50-0.
Opposition to the risk-free choice of Berto from a welterweight division packed with talent is unanimous and the legacy of the self-anointed 'The Best Ever' is being tarnished as formidable former foes such as Diego Corrales, Miguel Cotto and Oscar De La Hoya fade from memory.
Now UFC female bantamweight champion Rousey and Irish sensation McGregor have taken aim at the 38-year-old, who remains at the summit of boxing's pound for pound list.
Mixed martial arts knockout specialist Rousey won a bronze medal in judo for the USA at the 2008 Olympics and has become her sport's biggest name after ending all 12 of her fights early.
A ferocious woman, Rousey has made a not so subtle attack on Mayweather's history of domestic violence and now she believes she is the better fighter outside the ring.
"Do I think I would legit beat Mayweather in a ruleless fight? Floyd is one of the best boxers of all time," Rousey said.
"He would definitely beat me in a boxing match. I unfortunately don't get into 'matches'. I fight for a living. In a no rules fight, I believe I can beat anyone on this planet.
"Boxing is a sweet science with strict rules that I respect very much and aspire every day to improve at. But you said ruleless fight, and that's my honest answer."
Rousey has received support from McGregor, who has established himself as a household name in Ireland after posting 18 wins in 20 UFC outings.
"In a real fight I would dismantle him in seconds. Ronda would dismantle him in seconds - 100 per cent," McGregor said.
"When you don't know how to grapple you don't stand a chance. For us, it's like playing with a baby. People who don't understand the sport cannot understand how vulnerable they are.
"There are always clinches and Ronda is a judo Olympian. She would throw Floyd on his head in a second. Me? I would knock him out. Cold."