 Gamboa knocked out Estrada with a left hook to the body followed by a right hand to the face 25 seconds into the fight.On 17 April 2009 Gamboa stopped Jose Rojas via tenth-round TKO to win the WBA interim featherweight title.On 10 October 2009 Gamboa stopped Whyber Garcia in the fourth round to win the WBA featherweight title.