In past 5 weeks he played a lot of Tennis so his legs are getting tired. There's a reason why top players don't play every week but take breaks in btw. He should have pass on Hamburg, only 90 pts to lose and take extra two weeks to prepare for Olympics. let's hope that a week will be sufficient rest to get ready for playinfg doubles and singles, If rested I think him and Godig have a good chance in doubles.
It wasn't about legs, it was about head. Ok, fack is only one set ball was on his serve anh he missed ace for one inch. After he lost set on that way it was normal to loose a 2nd set. Pitty he didn't win, he would get 12th seed, 13th plce on the world, one more final and even title maybe.