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Ronda Rousey: I can beat Floyd Mayweather in 'no rules' fight

UFC star Ronda Rousey escalated her war of words with boxer Floyd Mayweather on Monday.
Mixed martial arts fighter Ronda Rousey trains at Glendale Fighting Club, July 15, 2015, in Glendale, Calif. (Photo by Jae C. Hong/AP)
Mixed martial arts fighter Ronda Rousey trains at Glendale Fighting Club, July 15, 2015, in Glendale, Calif.

UFC star Ronda Rousey escalated her war of words with boxer Floyd Mayweather on Monday, telling a Reddit AMA user she could beat the undefeated champ in a "no rules fight."

"Floyd is one of the best boxers of all time. 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," she wrote. "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 become a breakout, crossover star for the UFC in part because of her own undefeated record and now legendary string of nearly instantaneous take-downs of opponents. She earned headlines this past month when she referenced Mayweather's controversial history of domestic violence during a red carpet interview prior to this year's ESPY Awards, where Rousey took home the Best Fighter award over the boxing icon. 

RELATED: UFC champion Ronda Rousey knocks Floyd Mayweather for domestic abuse

“I wonder how Floyd feels being beat by a woman for once,” Rousey said. “I’d like to see you pretend to not know who I am now.” In a 2014 interview, Mayweather claimed he didn’t know who “he” was. Rousey later took home a Best Female athlete award at the ESPYS.

Mayweather eventually responded to Rousey's dig. In a characteristic move for the unapologetically money-obsessed fighter, Mayweather took a shot at Rousey's earning ability. "I’ve yet to see any MMA fighter, or other boxer, make over $300 million in 36 minutes. When she can do that, then call me."

The UFC struck back with an August 7 Twitter post pointing out that Rousey hasn't needed several rounds to defeat any of her challengers:

Meanwhile, Mayweather has already scheduled a bout against his next opponent, Andre Berto. If Mayweather wins that fight, for which he is heavily favored, he will tie Rocky Marciano's longtime undefeated record of 49-0.