Roger Federer and Justine Henin-Hardenne were selected the International Tennis Federation's world champions on Monday.
Federer became only the fourth player to win the men's award three straight years, joining Bjorn Borg, Ivan Lendl and Pete Sampras.
The 25-year-old Swiss star won three Grand Slam titles -- the Australian Open, Wimbledon and U.S. Open -- and lost in the French Open final to Rafael Nadal. He won 12 titles overall, compiled a 92-5 record and extended his huge lead at No. 1 in the rankings.
"It was a great year for me," Federer said.
Henin-Hardenne edged Amelie Mauresmo to win the women's award for the second time, adding to her success in 2003. The 24-year-old Belgian reached all four Grand Slam finals, winning the French Open. She won a tour-high six titles, including the season-ending WTA championships to finish as No. 1.
