Results from the WTA's Stuttgart clay-court tournament on Wednesday (x denotes seeding): 1st round Jelena Ostapenko (LAT) bt Stefanie Voegele (SUI) 6-4, 7-5 Karolína Pliskova (CZE x6) bt Tamara Korpatsch (GER) 7-5, 3-6, 6-3 Angelique Kerber (GER) bt Ekaterine Gorgodze (GEO) 6-2, 6-2 afp