Defending champion Coco Gauff knocked out of US Open fourth round by Emma Navarro

Defending champion Coco Gauff crashed out of the fourth round of the US Open with a 6-3 4-6 6-3 loss to fellow American Emma Navarro in New York.

Gauff had been looking to avenge her defeat by Navarro at Wimbledon, where she lost in the fourth round, but the 13th seed was high on confidence as she stunned the Arthur Ashe Stadium crowd with a dominant all-round display.

Gauff was her own worst enemy, however, especially on serve where the 20-year-old third seed struggled and had 19 double faults and 60 unforced errors.

Navarro's victory moved her into a second Grand Slam quarter-final where she will play Spain's 26th seed Paula Badosa, while defeat for Gauff will see her drop out of the top five in the world rankings.

Navarro said: "It's pretty insane. I lost in the first round the last two years and now to be making the quarter-finals is pretty insane.

"This is the city I was born in and it feels so special to be playing here.

"Coco is an amazing player. I have a ton of respect for her and I know she’s going to come back here and win this thing again."