Zheng Qinwen stages U.S. Open comeback as Naomi Osaka reaches fourth round

Zheng Qinwen stuns Madison Keys with a spectacular rally at the US Open. Fritz, Anisimova also lose

Olympic gold medalist Zheng Qinwen has extended her return to the U.S. Open with a spectacular and stunning rally, winning the final seven games to eliminate No. 22 Madison Keys 1-6, 7-6 (3), 7-5