I love Tiger so its difficult to say, but I'll take Federer as well. I loved Pete Sampras as well, but I believe Roger would consistently beat him. I don't think it is fair to Tiger to say since his match-play record is underwhelming Roger is better in his sport. PGA Golf Tournaments are 4 round competitions. Match-Play tournaments are difficult to gage b/c anyone can win on a given day. Tiger can even play several under in a match-play tournament and lose to a guy who fires a 66. Over 4 rounds, Tiger makes the field surrender. I believe Roger is in a more athletic sport, as someone else noted, and he's just a better athlete than a majority of these guys. The thing I like most about Roger is his complete game. He gets around the court like Michael Chang with a serve like Sampras. He's phenomenal at the net as well. He's the first tennis male tennis player in a long time outside of Sampras and Agassi that is fun to watch.