Grand Slam: Serena Williams' Most Memorable Moments

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  • Venus Williams, Serena Williams
  • Serena Williams, Venus Williams
  • Serena Williams
  • Serena Williams
  • Serena Williams
  • Serena Williams
  • Serena Williams
  • US Open
  • Serena Williams
  • Serena Williams

Health Scare and Comeback

In March 2011, Williams announced that she had received treatment for pulmonary embolism (blood clot formed in the lungs) and a hematoma (occurring when blood leaks out of vessels and pools in one location). She steadily competed that year, making it to the finals of the U.S. Open where she was defeated by Australia's Samantha Stosur.

(Photo: Mike Hewitt/Getty Images)