2009 Montreal Masters was a close affair that he should have won.
I can see it happening if he can play consistenly against the big guys. After injury he stills plays some great performances: 2011 FO Djokovic, 2011 WB Nadal, 2011 DC Nadal and Djokovic, 2012 FO Federer and Olympics Federer.
That type of play will help win a MS1000 event.
Why fight over who is G.O.A.T., when the world is just an abstract of reality~ http://www.newgrounds.com/portal/view/525347