Manny Pacquiao is a clear favourite with the Las Vegas bookies for Saturday evening's fight in that city. The rationale for that position is the easy victory Pacquiao had against Oscar de la Hoya last December.
Personally I think the two fighters are more evenly matched than the betting line reflects. It will depend on how soon in the fight and how often Ricky is able to land his heavier punches. If it becomes a dancing match Ricky could be in trouble as Manny is very quick.