null: The biggest fight to be made in women's MMA will take place on Saturday, February 28th. UFC women's bantamweight champion Ronda Rousey defends her crown for the fifth time against No. 1 contender Cat Zingano at UFC 184 in Los Angeles. The unbeaten Rousey has ripped through all contenders at 135 pounds, needing just a combined 82 seconds to defeat Sara McMann and Alexis Davis in her two most recent title defenses. Colorado's Zingano is also undefeated as a pro, and after back-to-back knockouts of Miesha Tate and Amanda Nunes, she has plenty of momentum on her side.