After retiring from the sport due to the birth of her baby girl, Kim Clijsters unretired from her 2 1/2 year hiatus to win the 2009 US Women's Singles Open by beating promising 19 year old, Caroline Wozniacki from Denmark, 7-5, 6-3. Clijsters defeated the Williams sisters, Venus and Serena on her way to winning the second US open title of her career. Congratulations Mommy !!