I was just going through the list. Soderling is dangerous, but he needs a good day and a poor day by one of the top four to get a win. Agreed that Fish has a better chance than Roddick right now. My ratings so far in order of odds...
Murray is cursed right now given the level of play from the other top players right now. But then Djokovic was cursed to and look at him now, so maybe Murray's got a hope, but he needs some brain adjustments to get there in my opinion.
What about Roanic? I was disappointed to see him struggle with injuries after a great start this year. I don't think Canada has ever had as high-ranked a player in men's singles as Milos was. Greg Rusedski (traitor) would have been the last good player out of Canada in singles.
On the women's side? Who knows. Depends on who shows up.
Kim if she's healthy. Serena is going to need a blessed draw to win. If she's healthy and motivated it's hard to bet against her, but I'm not sure she's motivated yet and having to play five top twenty seeds to win isn't going to help her if she hasn't sorted things out.