Third seed Jessica Pegula and Wimbledon finalist Ons Jabeur suffered defeats in the fourth round at the US Open.
American Pegula, who had been one of the favourites for the title, put in an error-strewn performance in a 6-1 6-3 loss to compatriot Madison Keys while last year’s runner-up Jabeur lost 6-2 6-4 to China’s Zheng Qinwen.
20-year-old Qinwen reached the first Grand Slam quarter-final of her career and will next face Belarusian second seed Aryna Sabalenka, who won 6-1 6-3 against Russian 13th seed Daria Kasatkina.
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