Federer vs. Nadal Goodmonson: Seventeen Grand Slams. You can't argue with that. Federer's the greatest of all time. Harry Harryman: You can't be the greatest if you always lose to the guy who's supposed to be the second greatest. Federer's great but Nadal is the greatest. Steve Bytheway: There's an easy way to settle this debate. Nadal likes clay while Federer likes grass, right? Harry Harryman: Yes. Steve Bytheway: So who's the goat?