#2 Ronda Rousey vs Justin Beiber
She may not be the queen of MMA anymore, but Ronda Rousey's exploits will be highlighted in history, even those outside the cage. Especially that time she came tantalizingly close to ripping Justin Beiber's arms off his twiggy torso.
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An incovenient truth it may be, but every teenage girl has at some point, dreamt about meeting the Biebs and getting his autograph. At the 2014 Cannes Film Festival, Rousey's younger sister Julia thought she would get to live out this dream when she spotted the Canadian teeny pop sensation. Possibly because she was too shy to go ask him herself, Ronda walked upto Bieber and asked him for an autograph. The multi-platinum selling "hearthrob" blew her off and walked away, leaving Julia in tears and Ronda in disgust.
When Bieber heard about this in November 2015, he apologized to Rousey, but in the same interview, dissed her for getting knocked out by Holly Holm. He followed that up by slinging mud at her once more when she was finished by Amanda Nunes. The legendary women's MMA pioneer didn't deign to respond, but speaking on behalf of all fight fans, we wished she had, preferably with an armbar.