US Open: Coco Gauff crushes Madison Keys to reach last 16

Coco Gauff dominated fellow American Madison Keys to win 6-2 6-3 on Friday and reach the U.S. Open fourth round for the first time. The 18-year-old Gauff, who was once again called on to warm up Arthur Ashe Stadium court for Serena Williams ahead of her compatriot's highly-anticipated night match, has now made the second week of all four Grand Slams.