China's Zheng Qinwen mounted another extraordinary fightback from 5-0 down to defeat six-times Grand Slam champion Iga Swiatek.
Olympic gold medallist Zheng, who had to come through US Open qualifying, stunned six-time Grand Slam champion Iga Swiatek 7-5, 6-3 to reach the quarter-finals.
It was another gritty win for the Chinese star, a former world number four now ranked 121st in the wake of elbow surgery last year.
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