Roger Federer and Justine Henin are the International Tennis Federation World Champions for 2007.

Federer became only the second man to win the ITF's award in four straight years, 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 WTA Championship.

"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.

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