After the only second-round match held on Wednesday, in which Simona Halep progressed past Magdalena Rybarikova, the rest of second-round action completed on Thursday, defining the quarterfinal draw of the Porsche Tennis Grand Prix in Stuttgart.
The day was marked by three retirements: second seed Garbine Muguruza withdrew with a back problem after losing the first set of her encounter with Anastasia Pavlyuchenkova, Angelique Kerber pulled out with a leg injury after dropping eight straight games to Anett Kontaveit, and Marketa Vondrousova had to quit her match with Elina Svitolina midway through the third set because of a leg problem.
Defending champion Laura Siegemund fell to American Coco Vandeweghe 6-4 4-6 6-3, sixth seed Caroline Garcia stopped 15-year-old phenomenon Marta Kostyuk, fifth seed Karolina Pliskova beat Veronika Kudermetova and fourth seed Jelena Ostapenko lost just three games against Zarina Diyas.
MORE PHOTOS FROM THE 2018 PORSCHE TENNIS GRAND PRIX:
- Wednesday: Halep reaches quarterfinals, Kerber beats Kvitova in the first round
- Tuesday: Siegemund kicks off title defense, Garcia beats Sharapova
- Monday: Players’ Night, Porsche Parking Challenge, completion of qualifying, start of main-draw action
