Uso also looks unlikely as he simply can't hang against guys who can read his serve.
How many players can do that?
This didn't look like an acceleration in his decline at all. His movement was good, even to his forehand side: it's just Berdych was able to anticipate his shots and send them back with interest. The forehand errors in the 1st 2 sets cost Fed the match, & I would attribute them to rustiness.