After last night's vicious knockout  it seems like Manny Pacquiao is definitely past his prime. A few months ago, Pac-Man was the victim of one of the most questionable decisions in recent memory in his "loss" against Timothy Bradley. Last night, Pacquiao lost in more convincing fashion to Juan Manuel Marquez. Marquez connected with a devastating KO punch that sent Manny face-first to the canvas in the sixth round.

Does the losing streak mean Pacquiao should retire? Trainer Freddie Roach wouldn't rule out the possibility.

Roach said he'd like to see Pacquiao work out in the gym before allowing him to continue to box. But if he isn't the same, the trainer extraordinaire will advise him to hang up those gloves:

"Possible retirement, possible rematch; I'm not sure which way we're going to go right now. It really depends upon how he feels and what he wants to do. We'll get back in the gym and if I see signs of decline, I'll tell him to retire. If I don't, I'll tell him to go on."

It's fair advice, but what's even more intriguing is what might be going through Pac-Man's head right now. According to a ABS-CBN News, Pacquiao's wife, Jinkee, spoke to him about retiring just hours after last night's bout. Manny just remained silent.

Pacquiao will go down as one of boxing's greats if he decides to retire with his record of 54-5-2 and eight division world titles. But is this the way to go out?

RELATED: Juan Manuel Marquez Defeats Manny Pacquiao via Sixth-Round Knockout (Video)

[via Yahoo! Sports, ABS-CBN News]