I think Mardy Haddock will cause an upset this year...
Can't say Andy will cause an upset due to the fact he is expected to beat the best players but if he loses then I see it as unfortunate or he is tired

.
Federer will be tough for anyone on any surface but I think QF will be his highest this year at the U.S OPEN,
as for Djokovic his prime is well gone as well as Bagdahtis in my eyes out in 3rd round 4 both.
I am no psychic but I am guessing Nadal will get the news that he has wedgie syndrome a condition only Nadal has been diagnosed with

and forced to pull out.
Final... Murray vs.... (cant be bothered to look at draw)