September 3, 2018
Novak Djokovic, of Serbia, puts an ice towel around his head during a changeover against Joao Sousa, of Portugal, during the fourth round of the U.S. Open tennis tournament, Monday, Sept. 3, 2018, in New York. (Carolyn Kaster/AP)
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NEW YORK — Facing much more resistance from the 90-degree heat and 50-percent humidity than from his outclassed opponent, Novak Djokovic figured he can count on cooler conditions during a night match at the U.S. Open his next time out.