Coco Gauff defeats Madison Keys with ease at US Open

Coco Gauff dominated fellow American Madison Keys to win 6-2 6-3 and reach the US 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. Gauff began tentatively and was broken in the first game but quickly regrouped, breaking back and firing an ace up the tee for a 4-1 lead she would not relinquish. The 12th seed maintained her level in the second set as she redirected former finalist Keys' powerful groundstrokes and sealed the win on her opponent's 22nd unforced error. The French Open finalist, who improved to 11-3 at majors this year, said she was honoured to open up for Williams at the tournament for the third time and would be again glued to her idol's match. "It's been amazing. I haven't missed it," Gauff said. "Even the day when I watched it on TV I had to order room service. I know she's on my side of the draw and I don't know when I might face her but that's the goal." Gauff will be the favourite when she takes on China's Zhang Shuai on Sunday.

Tunisian fifth seed Ons Jabeur survived a thrilling duel to down home hope Shelby Rogers 4-6 6-4 6-3, making the fourth round at Flushing Meadows for the first time. The Wimbledon finalist squandered six of the eight break points she earned in the opening set but hit her stride in the second as she dropped just two first-serve points. Rogers called on the trainer to receive some treatment on her right arm before the start of the third set and with Jabeur sprinting through the first four games it seemed all over. But the American refused to cave in and fought off five match