 Instead of a title shot, Campbell's next bout was another eliminator, which he won over Ricky Quiles.After knocking out Wilson Alcorro, his next bout was a split decision victory over the undefeated Juan Díaz on March 8, 2008 to become the new IBF, WBA, and WBO unified World Lightweight Champion.Campbell was the underdog coming into the fight, as Díaz was considered too strong and too technically sound.