Not only did it put Konjuh into her first WTA quarterfinal, but the 16-year-old Croat became the youngest WTA quarterfinalist since Donna Vekic at Tashkent in September 2012. Her next opponent will be WTA Rising Star Elina Svitolina.
As for Vinci, she was up 6-3, 4-1 on Alexandra Dulgheru when the Romanian qualifier retired with a right shoulder injury. That improved Vinci to 4-0 in their head-to-head, including a straight set victory just last week in Bucharest - where the Italian reached her first WTA final in a year.
"I played well tonight," Vinci said. "It was tough, but this surface suits me and I am pleased with my game overall. I was sorry that she had to retire, but am happy that I am in the quarters and am ready for tomorrow."
Next up for Vinci is sixth-seeded Kurumi Nara, who was a 7-6(5), 6-7(3), 6-2 winner over Czech qualifier Katerina Siniakova in two hours and 52 minutes. The Japanese came into this week ranked a career-high No.38.
Also advancing was No.8 seed Karolina Pliskova over Shahar Peer, 6-2, 7-5. That set up a showdown with No.1 seed Caroline Wozniacki, whom she is 0-2 against though she extended the Dane to a third set in both meetings.