How many players need to withdraw for Nadull to win the US Open? 50?
Not that much, considering Fedal will be in the same half with Nishikori or Murray, whereas, as at the last USO, all the other contenders, dark horses/ponies and big servers will land in Djokovic' half; Nishi or OBE, Stanimal, Tsonga, Cilic, Monfils, Raonic, Isner, Anderson etc.
So, too make the semis against Nishi or OBE, Nadalito has to beat Simon and then Olderer, hoping that Nishi or Murray will be tired and subpar for SF or even better out, so that his SF opponent (as at USO '10 and '13 SF exhibitions) is Gasquet or Youzhny and the other finalist plays tough SF 5-setter and also has less time to recover (as Djokovic at already mentioned USO'10 and '13).