Despite the fact that "Sugar" Shane Mosley is legitimately one of the top three welterweights active in boxing at the moment, he will enter his fight against Manny Pacquiao as a heavy underdog. The odds have Shane sitting at between +500 and +600 while Pacquiao is as much as a -1000 favorite. That means that you'd have to bet $1,000 just to win $100 if you make a play on Manny. Here's a rundown of the odds at major books currently:
Against Mayweather, Mosley only entered the ring as a +250 underdog, but he was fresh off his trouncing of Antonio Margarito at the time. I still wouldn't be shocked to see the line move a little with late money coming in on Shane.