I think he is already a tier one great, his 2011 season was one of the top 3 best calendar performances ever, his won 3 slams in a row, 13 consecutive semi-finals in grandslams, been world number One, been in top 3 for 4-5 consecutive years, won Aus open 3 consecutive times, beaten 2 Goat contenders (Fed,Nad) in multiple grandslam finals/semi-finals.
He may not have 8,9 or 12 Slams, but his only going to win more and has already accomplished what maybe only 0.1% of all professional tennis have ever accomplished.
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