An inspiration for mothers everywhere: Kim Clijsters became the first unseeded woman to ever win the U.S. Open on Sunday, beating Caroline Wozniacki 7-5. 6-3. Clijsters retired in 2007, citing injuries and a desire to start a family. “It still seems so surreal," the Belgian tennis star said. "In my third tournament back, I won my second Grand Slam. It wasn't the plan.” She is the first mother since 1980 to win a Grand Slam singles title.