One boxing legend backs another.

Former middleweight and light heavyweight champion Bernard Hopkins is the oldest man to ever win a world title at 49.

He is no stranger to success, having extended his own record when scoring a 12-round split decision win over Beibut Shumenov in April 2014.

Manny Pacquiao, boxing's only eight-division world champion, will return after a near four-year retirement at 46 when challenging WBC welterweight titleholder Mario Barrios at Las Vegas' MGM Grand on July 19.

If Pacquiao, a 5/2 (plus-250) underdog, is able to upset the Mexican-American champion, he would become the second-oldest fighter to win a world title behind Hopkins. The man himself is backing the Filipino icon, 16 years Barrios' junior, to emerge victorious.

"I'm rooting for Manny because I know if anyone can do it, it's him," Hopkins told The Ring. "I think Barrios is a B-plus [fighter]. I believe, yes, [Pacquiao's] got some mileage on him, yes, he's politically mentally tied in, but he has the speed, he has the experience to get the upset.

"As a matter of fact, Manny could beat him by decision. He won't get the stoppage."

Pacquiao-Barrios, plus undercard bouts, will be broadcast on Amazon Prime at 8 p.m. ET/ 1 a.m. GMT next Saturday.