On April 1, 2006, Aiken defeated former IBF bantamweight champion Tim Austin by sixth-round TKO.[1] Only one month later (on May 13, 2006), Aiken challenged undefeated IBF featherweight champion Valdemir Pereira for the title. In the bout, Aiken knocked down Pereira in rounds four and five.[2] Throughout the bout, Pereira hit Aiken with shots that were below the belt, and he was penalized one point in rounds six and seven.[2] After another below the belt shot by Pereira in round eight, the referee disqualified him, and Aiken was awarded the title.[1][2]