Pacquiao's pay-per-view fights have generated nearly $1.3 billion in revenue, including a staggering $400 million for his highly publicized 2015 fight against Mayweather. That fight also represented Pacquiao's highest payday to date, with him bringing in an estimated $130 million from the bout.

Here's when to expect Manny Pacquiao and Mario Barrios to walk out to the ring for their WBC welterweight title fight in Las Vegas.

Former world champion Manny Pacquiao is embracing his underdog status as he gets ready to turn back the clock when he steps out of retirement to face WBC welterweight champion Mario Barrios in their Saturday showdown at the MGM Grand.