Terence Crawford, boxing's pound-for-pound king, announced his retirement from the sport on Tuesday evening with a perfect 42-0-0 record, with 31 wins coming by way of knockout.

Legendary Omaha boxer Terence 'Bud' Crawford announced his retirement Tuesday evening at age 38.

The American, who finishes with a perfect record of 42-0, made history in September when he beat Saul 'Canelo' Alvarez to become the first male fighter in the modern era to hold undisputed titles in t...