** FILE ** Kim Clijsters, of Belgium, left, shakes hands at the net with her compatriot Justine Henin after her 6-2, 6-3, victory over Henin in their quarterfinal match at the Australian Open Tennis Championships in Melbourne, in this Wednesday, Jan. 23, 2002 file photo. Kim Clijsters announced her immediate retirement from tennis on Sunday, May 6, 2007 cutting short plans to stop playing at the end of the season because of chronic injuries. The fourth-ranked Belgian ended her 10-year career in a statement on her Web site. (AP Photo/Steve Holland)