9. Ronda Rousey
She was a game-changer, a forerunner for what was to come. Rousey blazed a trail to the Ultimate Fighting Championship for women who once thought it all but impossible. She has compiled a 6-2 record in UFC title fights, registering consecutive wins over Liz Carmouche, Miesha Tate, Sara McMann, Alexis Davis, Cat Zingano and Bethe Correia before back-to-back knockout losses to Holly Holm and Amanda Nunes sent her career off the rails. Rousey, the first American woman to capture an Olympic medal in judo, was at the height of her powers during a four-fight tear between Feb. 22, 2014 and Aug. 1, 2015. In that span, she defeated McMann, Davis, Zingano and Correia in 2:10 combined.
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