Court conditions more suitable for Olympic swim star Michael Phelps than tennis stars had USA 14th seed John Isner , who beat teen Frances Tiafoe 7-6 (7/4), 7-5, happy he snuck in a win between storms. But Halep has lost two prior matches this year with a chance to ascend to number one, falling to Jelena Ostapenko in the French Open final and to K...