[img]http://d.yimg.com/a/p/ap/20090915/capt.6e754e17a2ec4967b85887dd457a4cb8.us_open_tennis_uso216.jpg?x=89&y=130&q=85&sig=0raz_dQxZp640da33QlIjQ--[/img]AP - Always so cool, so consistent, so in control of his emotions and his matches, Roger Federer amazingly let the U.S. Open championship slip from his grasp.