Jul 31 (OPTA) - Results from the WTA Premier, San Jose Women's Singles matches on Tuesday .. 1st Round .. Daria Kasatkina (RUS) beat Mihaela Buzarnescu (ROU) 6-2 6-2 7-Maria Sakkari (GRE) beat Ekaterina Alexandrova 6-1 6-4 (RUS) Saisai Zheng (CHN) beat Heather Watson (GBR) 6-3 6-1 8-Danielle Collins (USA) beat Shuai Zhang (CHN) 6-4 5-7 6-2 5-Donna Vekic (CRO) beat Misaki Doi (JPN) 6-4 3-6 6-4 Victoria Azarenka (BLR) beat Harmony Tan (FRA) 6-2 6-4 Coco Vandeweghe (USA) beat Marie Bouzkova (CZE) 6-2 6-4