Based on this interview he has been laboring a shoulder injury for a while now since Eastbourne. he dropped his racquet by 10 pounds.
Q. How is your shoulder?
ANDY RODDICK: Shoulder's okay. You know, whatever.
Q. When you woke up yesterday...
ANDY RODDICK: It's not great. But, you know, it's good enough. I got max a week of tennis left, so it's good enough for that.
Q. Loosening the tension?
ANDY RODDICK: Yea I loosened it. The day before I played Eastbourne, I dropped my racquet 10 pounds just so I could get a little sling action in it and help the old Hamburger Helper here
Q. The Hamburger Helper, are you going to need surgery or rest when this is all said and done?
ANDY RODDICK: I don't know. A lot of times they said, You want an MRI of your shoulder? I said, For what? If it's a year or nine months of surgery, I don't want to know about it.