PRAGUE — Slovak qualifier Rebecca Sramkova upset top-seeded Petra Kvitova 7-6 (5), 3-6, 6-4 to advance to the second round of the Prague Open.
It was another early exit for Kvitova after she was defeated by Sloane Stephens in the first round of Wimbledon, the Grand Slam she had won twice.
For Kvitova, French Open champion Barbora Krejcikova, Marketa Vondrousova and Katerina Siniakova, the hard-court tournament serves as a warmup for the Tokyo Olympics.
All the previous editions of the tournament since it became part of the WTA circuit in 2015 were played on clay.
In other first-round games, seventh-seeded Nina Stojanovic of Serbia knocked out Vitalia Diatchenko of Russia 6-7 (5), 6-1, 6-3 while ninth-seeded Greet Minnen of Belgium defeated Giulia Gatto-Monticone of Italy 6-0, 4-6, 6-1.
Former U.S. Open champion Sam Stosur of Australia recorded her sixth straight loss. She was eliminated by American Grace Min 6-3, 2-6, 6-3.
Another American, qualifier Asia Muhammad, rallied to overcome Lizette Cabrera of Australia 3-6, 6-2, 6-2 and Czech Tereza Smitkova eased past Australian Maddison Inglis 6-2, 6-2.
PARMA, Italy — Top-seeded Maria Sakkari rallied past 97th-ranked Maryna Zanevska 2-6, 6-4, 6-4 on Thursday at the Parma Ladies Open to reach her first semifinal since the grass-court season.
Sakkari, who has gone three sets in all three of her matches this week, will face Danka Kovinic for a spot in the final of the clay-court event after Kovinic beat Jasmine Paolini 6-4, 6-4.
In her previous semifinal, Sakkari lost to Belinda Bencic in Berlin in June. The seventh-ranked Greek player was eliminated by Wang Xiyu in the second round of the U.S. Open on Aug. 31.
In the bottom half of the draw, Mayar Sherif of Egypt beat American opponent Lauren Davis 7-6 (2), 6-3 to reach her second career semifinal. Sherif next faces Ana Bogdan, who defeated fellow Romanian Irina-Camelia Begu 6-2, 7-6 (6).
PARMA, Italy — Top-seeded Maria Sakkari rallied past Arantxa Rus 3-6, 6-2, 6-3 to reach the quarterfinals of the Parma Ladies Open.
Sakkari, who accepted a late wild card to the red clay court tournament, was playing her first event since losing to Wang Xiyu in the second round of the U.S. Open.
The Greek player will next face Maryna Zanevska of Belgium after she eased past Dalma Galfi 6-1, 6-3.
Fourth-seeded Sloane Stephens of the United States, the 2017 U.S. Open champion, lost to Danka Kovinic 7-5, 2-6, 7-5.
Kovinic will face Jasmine Paolini in the quarterfinals after the Italian defeated compatriot Elisabetta Cocciaretto 4-6, 6-3, 6-4.
There will be an American in the final eight, however, as Lauren Davis rallied to beat Sara Sorribes Tormo 3-6, 6-4, 7-5. Sorribes Tormo had eliminated second-seeded Martina Trevisan in straight sets in the opening round.
Davis will play Mayar Sherif after the Egyptian player defeated Simona Waltert 6-3, 7-6 (1).
Also, third-seeded Irina-Camelia Begu of Romania eased past Italian wild card Matilde Paoletti 6-4, 6-4 to set up a quarterfinal against sixth-seeded Ana Bogdan, who beat Anna Karolina Schmiedlova 6-2, 3-6, 6-3.