Between Floyd Mayweather's drug accusations and a close call against Juan Manuel Marquez last November, "Pac-Man" should be used to running from ghosts.

But is he also running from an inevitable retirement?

Famed boxing champion Manny Pacquiao will put his WBO welterweight title on the line against undefeated up-and-comer Timothy Bradley this Saturday night (June 9, 2012) live on pay-per-view from the MGM Grand Garden Arena in Las Vegas, Nevada.

While Pacquiao's longtime trainer Freddie Roach expects his star pugilist to "eat up" his challenger this weekend in "Sin City," there remains the distinct possibility he could "look bad," which would prompt the Roach Coach to call for an early retirement.

His comments to the Associated Press (via The Washington Post) after the jump.

"[Bradley's] no killer, but he tries hard. Manny should eat him up as he comes forward. I think Manny should look really good in this fight. If he looks bad, he retires. At least I’ll tell him to. And he may be the first one who will listen to me."

Pacquiao may not be the only one contemplating retirement, but could be the first of the current mega-stars to call it quits pending this weekend's outcome in "Sin City."

Bradley (28-0) has just 12 knockouts on his resume and despite his reputation for being a dangerous fighter, many fans of the "sweet science" believe he lacks the fistic firepower to topple the Filipino superstar.

But if he can, it will all but seal the fate of a potential Mayweather vs. Pacquiao "superfight."

Who's calling upset?

Get more information on the upcoming "Pacquiao vs. Bradley" title fight right here.