- German second seed Angelique Kerber defeated Petra Kvitova 6-3, 7-5 to reach the US Open quarter-finals. She will play Italian seventh seed and 2015 runner-up Roberta Vinci for a place in the semi-finals. Kvitova served up a seventh double fault to hand Kerber victory having committed 43 unforced errors. Vinci, the 2015 runner-up, reached the quarter-finals for the fourth time but had to shrug off a tendon injury in her leg to prevail. "I love to play here. The atmosphere, the crowd, everything is great," said Vinci who knocked out Serena Williams in the semi-finals in 2015 before losing the final to compatriot Flavia Pennetta. Kerber and Vinci are 2-2 in head-to-head meetings but haven't played since Beijing in 2013.