He very obviously isn't climbing as well as he used to. All you need to do is look at his results. He said yesterday that it was his only chance for a victory. Maybe him and his team overstimated the difficulty of today's stage and he possibly could've hung on but that would've changed the dynamic of the race imo as riders wouldn't want to sprint against Sagan and he would've had no teammates left to control attacks.Dropped on the final climb today, on a sprint stage contested by Colbrelli (1st) and Ulissi (5th). In years past, those would be some of the guys that Sagan's team would be trying to drop on a hilly enough stage. I don't know what it is, but I've been saying for a while now that he really doesn't look like as comfortable a climber any more.