Who is the defending Men's Champion of Australian Open ?
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Rafael Nadal
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Roger Federer
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Marat Safin
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James Blake
A
Correct answer
Explanation
Rafael Nadal was the defending Men's Champion at the Australian Open in 2009-2010, having won the 2009 title against Roger Federer. This question reflects that specific time period when Nadal held the title. Federer and Safin are past champions, while James Blake never won the Australian Open.