Djokovic and Swiatek roll, Tsitsipas falls in hot, sticky US Open second round

Mirra Andreeva, of Russia, returns a shot to Coco Gauff, of the United States, during the second round of the U.S. Open championships Wednesday in New York. (AP Photo/John Minchillo)

Iga Swiatek, of Poland, returns a shot to Daria Saville, of Australia, during the second round of the U.S. Open championships Wednesday in New York. (AP Photo/Mary Altaffer)

NEW YORK (AP) — Novak Djokovic and Iga Swiatek rolled to straight-set victories to move into the third round at the U.S. Open on Wednesday, fighting not only their opponents but sticky, 85-degree Fahrenheit (29-degree Celsius) weather on the hottest day at the tournament so far.