Tell that to Federer.
I know I was way off. 1 of my worst predictions I said that 2012 was his last chance to win a gold medal, if he hasn't retired by Rio Olympics, then he will have dropped down the rankings that he's making up the numbers. & not only has played beyond Rio Olympics he's won 3 grand slams. so couldnt been worse
but the difference between the big 4 is they have all had injuries, but Djokovic Nadal & Federer have had treatable injuries. but murray hip is degenerative unless he gets a hip replacement