No. 1 Swiatek, Kvitova reach Agel Open quarters
OSTRAVA, Czech Republic -- Top-ranked advanced to the quarterfinals of the Agel Open after retired with an injury during the second set of their second-round match on Wednesday.
The Polish US Open champion was leading 7-5, 2-2 when her Australian opponent retired due to a left knee injury at the indoor hardcourt event in the eastern Czech city of Ostrava.
Swiatek, who also won the French Open in June, will next face American qualifier or .
Home favorite and two-time Wimbledon champion upset second-seeded of Spain 7-6 (4), 6-4 to set up a quarterfinal against this year's Wimbledon winner , who rallied to eliminate 6-7 (5), 6-4, 7-5.
Czech players also won the last two first-round matches on the schedule.
Muchova knocked out seventh-seeded of Brazil 6-4, 6-4 and ousted American 6-2, 6-2 for her sixth straight victory after she won the Tallinn Open on Sunday for her first WTA title of the year.