Watching the French Open, I've become a fan of Gaël Monfils and his athleticism. His semi-final match against Roger Federer was really great to watch, both players were able to play to their strengths, and the partisan crowd made for some great atmosphere. It seemed like the two players enjoyed the match as much as the crowd did, too.
On the ladies' matches, I think Ana Ivanovic is really pretty. =P And I really admire Dinara Safina's grit and ability to come back from opponents' match points to take the match eventually.