Ronda Rousey

Ronda Jean Rousey (born February 1, 1987) is an American mixed martial artist, judoka and actress. She is the first and currentUFC Women's Bantamweight Champion, as well as the last Strikeforce Women's Bantamweight Champion.

She is undefeated, having won eight of her ten fights by armbar. Rousey became the first American woman to earn an Olympic medal in Judo at the Summer Olympics in Beijing in 2008.

Source: Wikipedia