Which Belgian won the 2009 US Open women's singles title as a wild card?

The Belgian who won the 2009 US Open women's singles title as a wild card was Kim Clijsters.

Clijsters defeated Denmark's Caroline Wozniacki 7–5, 6–3 in the final. It was her second US Open championship, following her 2005 title, and her second major singles title overall. She entered the tournament unseeded after returning to professional tennis from more than two years of retirement.

Her comeback made the victory especially notable. Clijsters had given birth before returning to competition, and she became the first mother to win a major singles title since Evonne Goolagong Cawley won Wimbledon in 1980. She also defeated both Williams sisters during the tournament: Venus in the fourth round and defending champion Serena in the semifinals.

The wild-card detail is essential. Clijsters did not qualify through the normal ranking route because she was unranked when she came back. Elise Mertens, Yanina Wickmayer, and Justine Henin are also Belgian players associated with major tennis, but none was the 2009 US Open women's singles champion.