It was Konta’s first time in the last sixteen of a Grand Slam.The two-time Wimbledon champion beat her in straight sets, 7-5, 6-3. Meanwhile, Roger Federer’s through to the quarter-finals where he’ll meet Richard Gasquet. He was beaten by South African Kevin Anderson in four sets.The British number one failed to win a single point in the fourth set tie break.Britain’s Johanna Konta is out of the US Open at the fourth round stage at the hands of Petra Kvitova.