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Ronda Rousey celebrates her first bantamweight title defense, (Credit: Showtime/Esther Lin)

Ronda Rousey celebrates her first bantamweight title defense, a first-round submission of Sarah Kaufman, at Strikeforce in San Diego. (Aug. 18, 2012)

Strikeforce: Rousey vs. Kaufman

Ronda Rousey's firs title defense headlined Strikeforce's card in San Diego. (Aug. 18, 2012)

Sarah Kaufman begins her entrance for the main
(Credit: Showtime/Esther Lin)

Sarah Kaufman begins her entrance for the main event, a bantamweight title match against champion Ronda Rousey, at Strikeforce in San Diego. (Aug. 18, 2012)

Sarah Kaufman begins her entrance for the
(Credit: Showtime/Esther Lin)

Sarah Kaufman begins her entrance for the main event, a bantamweight title match against champion Ronda Rousey, at Strikeforce in San Diego. (Aug. 18, 2012)

Bantamweight champion Ronda Rousey makes her way to
(Credit: Showtime/Esther Lin)

Bantamweight champion Ronda Rousey makes her way to the cage to defend her title against Sarah Kaufman in the main event at Strikeforce in San Diego. (Aug. 18, 2012)

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Champion Ronda Rousey, left, and challenger Sarah Kaufman
(Credit: Showtime/Esther Lin)

Champion Ronda Rousey, left, and challenger Sarah Kaufman meet for instructions before their fight at Strikeforce in San Diego. (Aug. 18, 2012)

Ronda Rousey threw just seven punches in her
(Credit: Showtime/Esther Lin)

Ronda Rousey threw just seven punches in her fight over Sarah Kaufman and defended her bantamweight title in 54 seconds with an armbar submission at Strikeforce in San Diego. (Aug. 18, 2012)

Ronda Rousey, left, threw just seven punches in
(Credit: Showtime/Esther Lin)

Ronda Rousey, left, threw just seven punches in her fight over Sarah Kaufman and defended her bantamweight title in 54 seconds with an armbar submission at Strikeforce in San Diego. (Aug. 18, 2012)

Ronda Rousey, left, defended her bantamweight title in
(Credit: Showtime/Esther Lin)

Ronda Rousey, left, defended her bantamweight title in 54 seconds with an armbar submission of Sarah Kaufman at Strikeforce in San Diego. (Aug. 18, 2012)

Ronda Rousey submitted Sarah Kaufman in 54 seconds
(Credit: Showtime/Esther Lin)

Ronda Rousey submitted Sarah Kaufman in 54 seconds of the first round to defend her Strikeforce women's bantamweight title. (Aug. 18, 2012)

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Ronda Rousey, right, used an armbar to submit
(Credit: Showtime/Esther Lin)

Ronda Rousey, right, used an armbar to submit Sarah Kaufman in 54 seconds and successfully defend her women's bantamweight title at Strikeforce in San Diego. (Aug. 18, 2012)

Ronda Rousey celebrates her first bantamweight title defense,
(Credit: Showtime/Esther Lin)

Ronda Rousey celebrates her first bantamweight title defense, a first-round submission of Sarah Kaufman, at Strikeforce in San Diego. (Aug. 18, 2012)

Ronda Rousey, left, celebrates defending her bantamweight title
(Credit: Showtime/Esther Lin)

Ronda Rousey, left, celebrates defending her bantamweight title in 54 seconds with an armbar submission of Sarah Kaufman at Strikeforce in San Diego. (Aug. 18, 2012)

Middleweight Jacare Souza knocked out Derek Brunson in
(Credit: Showtime/Esther Lin)

Middleweight Jacare Souza knocked out Derek Brunson in 42 seconds of the first round at Strikeforce in San Diego. (Aug. 18, 2012)

Middleweight Jacare Souza knocked out Derek Brunson in
(Credit: Showtime/Esther Lin)

Middleweight Jacare Souza knocked out Derek Brunson in 42 seconds of the first round at Strikeforce in San Diego. (Aug. 18, 2012)

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Jacare Souza celebrates his first-round knockout of Derek
(Credit: Showtime/Esther Lin)

Jacare Souza celebrates his first-round knockout of Derek Brunson at Strikeforce in San Diego. (Aug. 18, 2012)

Tarec Saffiedine, right, went the distance with Roger
(Credit: Showtime/Esther Lin)

Tarec Saffiedine, right, went the distance with Roger Bowling and won by unanimous decision at Strikeforce in San Diego. (Aug. 18, 2012)

Tarec Saffiedine, right, went the distance with Roger
(Credit: Showtime/Esther Lin)

Tarec Saffiedine, right, went the distance with Roger Bowling and won by unanimous decision at Strikeforce in San Diego. (Aug. 18, 2012)

Tarec Saffiedine went the distance with Roger Bowling
(Credit: Showtime/Esther Lin)

Tarec Saffiedine went the distance with Roger Bowling and won by unanimous decision at Strikeforce in San Diego. (Aug. 18, 2012)

Anthony Smith, bottom, beat Lumumba Sayers by first-round
(Credit: Showtime/Esther Lin)

Anthony Smith, bottom, beat Lumumba Sayers by first-round submission at Strikeforce in San Diego. (Aug. 18, 2012)

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Anthony Smith celebrates his victory over Lumumba Sayers
(Credit: Showtime/Esther Lin)

Anthony Smith celebrates his victory over Lumumba Sayers at Strikeforce in San Diego. (Aug. 18, 2012)

Ovince St. Preux dropped T.J. Cook in the
(Credit: Showtime/Esther Lin)

Ovince St. Preux dropped T.J. Cook in the first round, but the fight continued. OSP won by third-round knockout at Strikeforce in San Diego. (Aug. 18, 2012)

Ovince St. Preux connects on a monster left
(Credit: Showtime/Esther Lin)

Ovince St. Preux connects on a monster left hook in the third round that knocked out T.J. Cook at Strikeforce in San Diego. (Aug. 18, 2012)

Miesha Tate makes her way to the cage
(Credit: Showtime/Esther Lin)

Miesha Tate makes her way to the cage to fight Julie Kedzie at Strikeforce in San Diego. (Aug. 18, 2012)

Miesha Tate, right, survived a pair of third-round
(Credit: Showtime/Esther Lin)

Miesha Tate, right, survived a pair of third-round knockdowns and won by submission over Julie Kedzie at Strikeforce in San Diego. (Aug. 18, 2012)

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