Defending champion Coco Gauff crashes out to Emma Navarro at US Open

Coco Gauff is out of the US Open (Pamela Smith/AP)

Coco Gauff’s hopes of winning back-to-back US Open titles are over after she crashed out in the fourth round.

Gauff was aiming to become the first woman to retain her crown at Flushing Meadows since Serena Williams in 2014 but succumbed to a 6-2 4-6 6-3 loss to Olympic team-mate Emma Navarro.