IMO Mayweather would stay at #1 he just beat the Jr. W champion of the world in his last fight.

If Pacquiao wins he will be making a great case for #1 in the future depending on what Floyd does. For me he stays at #2.

If Marquez wins he'd move into #2.

If the lose for either guy is close they won't drop to far down the ratings but a blow out will push him outta the top 5