Thank you. Nadal is a great clay courter, and so was Bjorn Borg. You could argue that Federer would have won more FO titles had it not been for Nadal, but you can make that argument for other players as well. You still have to win that final match, even without a tough rival facing you. I agree though, every player has pluses and minuses, including Federer, Nadal, Sampras, Borg, and perhaps Laver as well. Nadal does have a very good record versus Federer, on every surface besides indoors. Federer has only slight edge over Nadal on hard courts (head to head).