One of the greatest fighters of the past 30 years is set to return to the ring on July 19 when Manny Pacquiao ends his retirement to face Mario Barrios. Pacquiao will be looking to add to his legendary resume by picking up another championship as Barrios' WBC welterweight title will be on the line.

Pacquiao has come out of retirement in search of Barrios' welterweight title — here's what you need to know.

Manny Pacquiao returns to the boxing ring for the first time in four years on Saturday to face Mario Barrios. The 46-year-old Pacquiao is understandably an underdog given his lack of recent time in the ring. WBC welterweight champion Barrios is 16 years younger than his opponent and has fought five more times than him over the last four years.