Depends on the nature of the loss. Remember that Rios has also just one official loss in his record and many thought he even won that fight versus Mike Alvarado. So it is not as if Rios is a journeyman or trial horse where losing to would sound the final bell for a fighter like Pacquiao. Rios is a somebody in boxing and still amiong the fighters projected to take over from the current elites. If Pacquiao loses in a close, hard fought contest against somebody like Rios, it does not mean he is kaput. It only means Rios is living up to the expectations of him as a top fighter of the morrow. Now it's another matter, if Rios kayoes or stops him brutally.

Pacquiao is supposed to steamroll Rios here. This is pretty much his Delvin Rodriguez. If he is anything less than stellar against Rios who in all honesty is a B-grade fighter who only knows how to come forward as did Margarito, Cotto, Clottey, Mosley, Hatton, De La Hoya, then he is done. And Rios isn't better than any of those fighter. He is no.6 ranked lightweight.

Yep so even though he gots better footwork and speed he better watch out because Rios does pack a punch too. If he loses its over.

Yes Pacqauio even said in an interview he will retire if he loses to Rios, but he said that he won't lose.

he's close to retirement he said he just got 1 or 2 more years left so its all over anyway... even if he beats rios.

For any real mega fight, probably, Manny is nearing the end and his KO loss to Marquez isn't something that one would expect any fighter could completely recover from.

Yes, definitely. Even Roach admits that.

Yes and he will lose.