Djoker' problem may be that he has a total cakewalk to the semi. That doesn't help matters if you play a great player in the semi. But yes I would be worried if that's the semi, Djoker still has great tennis in him. Also I hate to say it but I appear to be wrong about the draw for Fed, looks like the seeds are playing out and he is going to face Zverev, Dimitrov, Raonic/Sascha, and Djoker just to get to the final. That is tough, I expected a couple of them to be upset, still could happen but very unlikely.