Rafa Nadal, undoubtedly is the greatest at the moment. Federer and Djokovic are great but they only took advantage of Nadal to win slams finals when Nadal began to have series of injuries which impeded his agility and his performances. Also, when Nadal was at his best, he was able to cut down Federer's successes in winning grand slams final. b4 the emergence of Nadal, Federer had a field day on every opponent!

I wish Nadal come back like b4!!