Answer
Kostya Tszyu was the undisputed light welterweight champion before Terence Crawford. He won the title in 1994 and defended it 11 times before losing it to Zab Judah in 2001. Tszyu is considered one of the greatest light welterweights of all time, and his victory over Julio Cesar Chavez in 1996 is considered one of the greatest upsets in boxing history.