I love everything about this: Federer's aggression (he's not just coming in by the book; he's really coming after the ball and after Murray), Murray's retrieving, Federer's reaction. And the context: Fed just having lost his Wimbledon title to Nadal.
The Borg-McEnroe match point at Wimbledon, 1980, with Borg dropping to his knees, is also iconic. Used to love watching that one years ago.