Results from the WTA's Stuttgart clay-court tournament on Tuesday (x denotes seeding): 1st round Anna-Lena Friedsam (GER) bt Ulrikke Eikeri (NOR) 6-2, 6-0 Anett Kontaveit (EST) bt Julia Middendorf (GER) 6-2, 6-3 Ekaterina Alexandrova (RUS) bt Karolina Muchova (CZE) 4-6, 6-2, 6-3 Laura Siegemund (GER) bt Mona Barthel (GER) 6-4, 3-6, 6-1 Petra Kvitova (CZE x7) bt Jennifer Brady (USA) 6-4, 6-3 Aryna Sabalenka (BLR x5) bt Shuai Zhang (CHN) 6-2, 6-2 afp