He has won titles in eight distinct weight classes, starting with his first one, the WBC world flyweight title he won as a 112-pound teenager. His fights have generated more than $1.2 billion in gross domestic pay-per-view revenue, and his welterweight fight Saturday night against Timothy Bradley Jr. will be the 19th time Pacquiao has headlined an HBO pay-per-view event -- an unprecedented résumé for a non-American-born athlete.
With nothing left to prove, Pacquiao should stick with goodbye
