What if Fed wins three more slams, two wimbledons and a farewell US open. That would put him at 16 without a French. Assuming he makes the French final again, he'd have over 20 finals. Clearly that tops Sampras. But what if Nadal wins 3-4 more slams, including a US open. He'd be at 8-9 total slams, but with a complete place setting. I don't see Nadal lasting long enough to win many more than 10 slams. Not only is his game tough on his body, he seems to care for life outside of tennis. I guess it comes down to quantity vs. versatility. I'm likely to lean towards Fed. Yes, I'm a fan of his smooth classical game, but he really isn't Clay deficient, just overmatched. It would be interesting to know how many titles he has on clay. I think there's a real chance this could be a message board argument in 2014.