TENNIS:WORLD NUMBER ONE Justine Henin yesterday announced she was retiring from professional tennis with immediate effect.

"It's the end of a wonderful adventure but it's something I have been thinking about for a long time," the Belgian said.

Henin, the winner of seven grand slam titles, had been expected to defend her French Open crown later this month but instead opted to turn her back on the sport at the age of 25. "I am leaving as the world number one and that is important and it is always better to go out at the top," said Henin, who won 41 titles since turning professional in 1999.

"I have been driving my career based on an emotion but I didn't feel that emotion anymore since (last year's season-ending championships in) Madrid.

"At Madrid I felt I had reached the climax of my career. I had thought about taking a break, but in the end I didn't think this was the right decision. I decided on returning from (last week's tournament in) Berlin to stop now. I leave without any regrets and I know it is the right decision."

Henin became the first Belgian to win a grand slam title with her triumph at the French Open in 2003 and despite suffering numerous turmoils throughout her career, she did not let it affect her form on court.

Credited with owning the best backhand in the game, she bucked the trend of the power players on the tour by climbing to the top of the world rankings despite her slight build.

A winner of four Roland Garros crowns, two US Open titles and one at the Australian Open, Henin admitted the lure of completing her collection at Wimbledon was not enough to prolong her career.

"Winning Wimbledon would not have made me any happier," said Henin, who also captured Olympic gold in Athens four years ago. I didn't feel I was capable of winning there (Wimbledon). I stopped before Roland Garros because I asked myself if I could produce a better Roland Garros than last year and I realised I couldn't."