US OPEN TENNIS DAY 13 IN NEW YORK

Roger Federer reacts after match point in his semi final match against Nikolay Davydenko on day 13 at the U.S. Open in New York City on September 8, 2007. Roger Federer defeated Nikolay Davydenko 7-5, 6-1, 7-5. (UPI Photo/John Angelillo) .