It's probably not in the spirit of the thread to say "all of them, for different reasons." Since Borg was my first favorite, and then I added Vilas, I have always loved the clay, the French Open, and I've always preferred longer rallies to S&V tennis. But it's hard not to love Wimbledon, in the high British summer, and Centre Court is the St. Peter's of tennis. And, while I know people have a lot to complain about re: the US Open, it's my hometown tourney, and the one I get to go to. The down-side of the Aussie Open is that much of it happens in the middle of the night for me. But that's also an up-side, when I have the luxury of watching. It's sort of fun to be an "AO Vampire." And vicariously experiencing hot summer on my TV in the middle of our winter is a pleasure. I'll vote for Roland Garros, so as not to be a total fence-sitter, because of how long I've loved it, all the wins my favorites have had there, and because it's considered the greatest physical challenge, especially for the men.