LONDON  -- Roger Federer and Justine Henin are the ITF World Champions for 2007.

The International Tennis Federation (ITF) has announced that the world's top ranked players Roger Federer (L) and Justine Henin were the 2007 ITF World Champions. [Agencies]

Federer became only the second man to win the International Tennis Federation's award in four straight years Monday, joining Pete Sampras.

"Every year brings new challenges, and I am proud that I have been able to raise the level of my game when needed,'' said Federer, who won three Grand Slam titles this year and reached the final at the French Open.

Henin, who received the award for the second straight year and third time in her career, won two majors and the season-ending Sony Ericsson Championships.

"This has definitely been the best season of my career,'' said Henin, who was 63-4 with 10 titles in 2007 after skipping the Australian Open for personal reasons related to splitting up with her husband. "It has been a very challenging year overall, but I have stayed positive and proved that nothing is impossible if you work hard.''

The ITF is awarded based on performances at both professional tournaments and the Davis Cup or Fed Cup.

Bob and Mike Bryan won the doubles award for the men, and Cara Black and Liezel Huber were the women's champions.