Thiemo de Bakker, of the Netherlands, cools off during the match against Roger Federer, of Switzerland, at the Sony Open tennis tournament in Key Biscayne, Fla., Sunday, March 23, 2014. (AP Photo/Alan Diaz)

Sony Open Tennis

Thiemo de Bakker, of the Netherlands, cools off during the match against Roger Federer, of Switzerland, at the Sony Open tennis tournament in Key Biscayne, Fla., Sunday, March 23, 2014. (AP Photo/Alan Diaz)

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