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Ronda Rousey, right, grapples with Cat Zingano, defeating her in 15 seconds in a UFC 184 mixed martial arts bantamweight title bout, Saturday, February 28, 2015, in Los Angeles (Credit: AP/Mark J. Terrill)

Ronda Rousey, right, grapples with Cat Zingano, defeating her in 15 seconds in a UFC 184 mixed martial arts bantamweight title bout, Saturday, February 28, 2015, in Los Angeles (Credit: AP/Mark J. Terrill)