Not an easy list to make but always good for an argument (Lleyton Hewitt? I barely know how to spell his name), and No. 1 is no big surprise (no spoiler here): GQ has it's 10 Most Hated Athletes list, and thanks to the Sports Filter for the link.
Only problem with this one is that it lacks Canadian content, but I'm sure we can come up with some suggestions. Vince Carter and Todd Bertuzzi spring immediately to mind.