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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.

Matteo Berrettini blasts past Andy Murray at US Open

Italian Matteo Berrettini regrouped from a series of squandered chances in the third set to brush aside Britain's Andy Murray 6-4 6-4 6-7(1-7) 6-3, harnessing his powerful forehand to reach the fourth round of the US Open. Playing in the third round in New York for the first time in six years, Murray appeared utterly outmatched as Berrettini rocketed across nine aces and 19 winners in the first set and extinguished the Briton's sole break point opportunity. The situation went from bad to worse for the 2012 champion in the second set, when a dejected Murray tossed his racket towards his bench after handing 13th seed Berrettini the break with a double fault in the ninth game. But the tables turned as the 26-year-old Italian was unable to convert any of eight break point chances in the third set and handed his 35-year-old opponent the momentum in the tiebreak with a handful of unforced errors. Berrettini, who beat Murray in the Stuttgart final earlier this year, said he tried to play more "brave" in the final set, getting the critical break in the eighth game after forcing the two-time Wimbledon winner into a backhand error. "I guess you learn from the past a little bit," said Berrettini, who clinched the contest with an ace to cheers from the rowdy crowd inside Arthur Ashe Stadium.