A freak injury nearly sidelined Castelli's sporting life for good. Now, thanks to a new leg and unyielding determination, she's making a fresh start.
Maria Sharapova, the 2006 U.S. Open champ, is enjoying her highest world ranking since her return from a 2008 injury. But Serena's still the favorite.
The tennis star talks about her lack of singing talent, her laziness come practice time and how she treasures a picture with her grandma.