Djokovic will win the U.S Open this year. If he doesnt it will be a huge choke most likely. I dont think Djokovic is unbeatable on all surfaces for years to come or anything but the U.S Open this particular year is his to lose. Nadal isnt going to beat him on fast hard courts right now when he hasnt on either clay or grass this year. Federer wont catch Djokovic by surprise and wont beat Djokovic in 2 slams in the same year at this point. Del Potro is a wild card. Murray isnt able mentally or tennis wise to beat Djokovic in a slam right now.