Henin, no doubt. How about that match this year with Sharapova, she bageled someone in the set but the opponent had game points in all six games, it was a real war of a set but Maria won it by bagel. That has to be a very very rare occurence, if not the only time it's ever happened.
Freaky like the time Sampras served the rocket that busted clear through Rafter's strings, in Cincy I think it was. Odd how people never mention that.
Facing Federer book was called "pretty addictive" by Steve Tignor :)