on June 19, 2009 at Strikeforce Challengers: Villasenor vs. Cyborg against submission specialist Shayna Baszler and once again won via Unanimous Decision. The fight marked the first time that a women's bout was contested under five-minute rounds in Strikeforce. Women's Bantamweight Champion Kaufman was set to face highly touted Japanese standout Takayo Hashi at Strikeforce Challengers: Kaufman vs. Hashi on November 20, 2009, but the fight was later removed from the card. It was first rescheduled for January 2010, but finally took place on February 26, 2010. The fight crowned the first Strikeforce Women's Bantamweight Champion (135 lbs). Kaufman won the fight by Unanimous Decision. In an interview posted on May 12, 2010, Kaufman stated that she was no longer under contract with Strikeforce. However, Strikeforce maintained that Kaufman's contract was automatically extended following her title victory over Takayo Hashi and she remained with the promotion. Kaufman defended her Strikeforce title against Roxanne Modafferi at Strikeforce Challengers: del Rosario vs. Mahe on July 23, 2010. She won the fight via knockout due to a slam in the third round. Kaufman faced Marloes Coenen on October 9, 2010 in San Jose, California. Kaufman was defeated by Coenen at 1:59 of the third round by submission after tapping out to an armbar applied from the bottom. This marked the first loss in Kaufman's MMA career and she relinquished the Women's Bantamweight Championship. After losing Championship On July 22, 2011, Kaufman defeated Liz Carmouche via unanimous decision at Strikeforce Challengers: Voelker vs. Bowling III in Las Vegas, Nevada. On January 7, 2012, it was announced that Kaufman would face Alexis Davis in a rematch at Strikeforce: Tate vs. Rousey on March 3 in Columbus, Ohio. Kaufman won the back and forth bout via majority decision. Kaufman challenged Women's Bantamweight Champion Ronda Rousey on August 18, 2012, in San Diego, California. She was defeated by submission due to an armbar early in the first round. Kaufman's tenure with Strikeforce ended when the promotion ran its final show in January 2013, having been purchased and eventually closed by UFC owners Zuffa LLC. Invicta Fighting Championships Kaufman was scheduled to make her Invicta FC debut against Kaitlin Young at Invicta Fighting Championships 3 on October 6, 2012. However, on September 17, it was reported that Kaufman had suffered an injury and would not be able to compete. Kaufman faced Leslie Smith at Invicta FC 5: Penne