At which tournament did Arantxa upset world No. 2, Kim Clijsters?
2011 French Open
2010 Wimbledon Championships
2012 U.S. Open
2011 Australian Open
Answer
At the 2011 French Open, Arantxa, who was ranked No. 29, upset world No. 2, Kim Clijsters, in the fourth round. Arantxa, who was playing in her first French Open since 2007, was the only unseeded player to reach the quarterfinals.
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