Defending champion Coco Gauff (20) suffered a stunning defeat in the fourth round of the US Open, falling to American compatriot Emma Navarro (23). Navarro’s victory, sealed by a scoreline of 6-3, 4-6, 6-3, was built upon Gauff’s uncharacteristic serving struggles. Gauff, the third seed, committed a staggering 19 double faults and 60 unforced errors […]