Anna Kournikova

Anna Kournikova played in the Federation Cup at age 14 and won her first professional title at 15. Her good looks and signature braided blonde ponytail made her a fan favorite and eventually an off-court star; People magazine named her one of the "50 Most Beautiful People" of 1998. In 1999 she won her first Grand Slam title, a doubles victory with Martina Hingis at the Australian Open. In 2000 the Web portal Lycos named her the Internet's most-searched athlete. In December 2004 it was widely reported, but not confirmed, that Kournikova had married pop singer Enrique Iglesias in Mexico.

Extra credit: Kournikova has been compared to an up-an-coming U.S. tennis player, Ashley Harkleroad... Other tennis stars on Who2 include Jennifer Capriati, Martina Hingis, Serena and Venus Williams, and Amanda Coetzer.