My feeling is that all times Andy tries to play with confidence he doesn't find it. I don't know if he caused by heavy legs for building-up or others.
I hope he can rise his game and give more speed and balance in the next matches. Because this level is low for Berdych, Nadal ecc.
In fairness, Andy really hasn't had to do much against Youzhny. He'll step up a gear when he has to.