FILE - Jack Sock is tended to by medical personnel after collapsing on the court during play against Ruben Bemelmans, of Belgium, during the second round of the U.S. Open tennis tournament, Sept. 3, 2015, in New York. An Associated Press analysis shows the average high temperatures during the U.S. Open and the three other Grand Slam tennis tournaments steadily have grown hotter and more dangerous in recent decades. (AP Photo/Adam Hunger, File)

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