Can Manny Pacquiao, 46, become the second-oldest world champion in boxing history with a win over WBC welterweight titleholder Mario Barrios on Saturday in Las Vegas?

On the undercard, Tim Tszyu will rematch Sebastian Fundora, Isaac Cruz will rematch Angel Fierro, and Pacquiao’s own son will make his pro debut. Seven months ago, a video of Freddie Roach training ...