In which year's French Open did Hantuchová defeat No.1 Wozniacki?
2009
2011
2013
2015
Answer
The answer is 2011. In the third round of the French Open that year, Daniela Hantuchová, then ranked 22nd in the world, caused a major upset by defeating the top-ranked player, Caroline Wozniacki, in straight sets, with a final score of 6–1, 6–3.
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