I don't think Roger will beat Andy again..ever..Brad and Andy have figured out his game. What you have to do is get him all zoned out and in "lazy-Roger" state. Once this is done, he can't win.
Perhaps Andy could just break his knee-caps before a match, and be Tennis's Tonya Harrding.
I joke of course, Andy doesn't need to go through all this trouble. All he has to do is get in long baseline Rallys with Roger. Roger will eat his racquet..and have to retire..