re: Face it Federer is the GOAT

Federer has a winning record on hard courts (10–9) and grass (2–1), while Nadal leads on clay (13–2). Nadal also leads the head-to-head of their 12 Grand Slam matches (9–3), with five of these wins on the clay courts of Roland Garros, and two of the losses on grass at Wimbledon.

The head-to-head looks lot worse than it really is...

Obviously, Nadal is the greatest clay court player we are likely to ever see. 13 of his wins against Fed are on clay. If you take away the French Open wins, then Rafa has a 4-3 advantage in Majors. It's pretty simple: Fed is greatest player ever and just so happened to play at the same time as the greatest clay court player to ever play the game.