...Federer of Switzerland, reacts during his 4-6, 6-3, 7-5, 6-4 victory over Lleyton Hewitt of Australia, during the third round of the U.S. Open tennis tournament in New York...

...Federer of Switzerland, reacts during his 4-6, 6-3, 7-5, 6-4 victory over Lleyton Hewitt of Australia, during the third round of the U.S. Open tennis tournament in New York...

Top-seeded Roger Federer of Switzerland, reacts during his match against Lleyton Hewitt of Australia, during the third round of the U.S. Open tennis tournament in New York...

NEW YORK - SEPTEMBER 05: Lleyton Hewitt of Australia celebrates after winning the first set against Roger Federer of Switzerland during day six...

CINCINNATI - AUGUST 21: Roger Federer of Switzerland hits a forehand volley against Lleyton Hewitt of Australia during day five of the Western & Southern Financial Group Masters on August 21, 2009...

1-June 25, 2009 Lleyton Hewitt, of Australia, in action, defeating Juan Martin Del Potro of Argentina, 6-3, 7-5, 7...

Andy Roddick of U.S.,serves to Lleyton Hewitt of Australia, during their men's singles quarterfinal match at Wimbledon, Wednesday, July 1, 2009. (AP...

...JULY 01: Andy Roddick of USA reacts during the men's singles quarter final match against Lleyton Hewitt of Australia on Day Nine of the Wimbledon Lawn Tennis Championships at the All England Lawn...

...01: Andy Roddick of USA celebrates victory during the men's singles quarter final match against Lleyton Hewitt of Australia on Day Nine of the Wimbledon Lawn Tennis Championships at the All England Lawn...

WIMBLEDON, ENGLAND - JULY 01: Lleyton Hewitt of Australia celebrates during the men's singles quarter final match against Andy Roddick of USA...

Andy Roddick of U.S., left, shakes hands with Lleyton Hewitt of Australia, after defeating him, in their men's singles quarterfinal match at Wimbledon, Wednesday, July...

WIMBLEDON, ENGLAND - JULY 01: Lleyton Hewitt of Australia (R) shakes hands with Andy Roddick of USA after the men's singles quarter...

Lleyton Hewitt of Australia celebrates match point against Radek Stepanek of Czech Republic during their fourth round singles...

WIMBLEDON, ENGLAND - JUNE 27: Lleyton Hewitt of Australia plays a forehand during the men's singles third round match against Philipp Petzschner...

Lleyton Hewitt of Australia plays a return to Juan Martin Del Potro of Argentina during their second round...