US Open: Gauff seeks revenge as Zverev eyes open title

Defending champion Coco Gauff seeks a third successive US Open quarter-final spot on Sunday as former runner-up Alexander Zverev attempts to exploit the huge hole left in the draw by the shock exit of four-time winner Novak Djokovic. World number three Gauff tackles compatriot Emma Navarro, seeking to avenge the defeat she suffered at Wimbledon