WTA Madrid Open results on Friday (x denotes seeded player): 1st rd Aryna Sabalenka (BLR x5) bt Vera Zvonareva (RUS) 6-1, 6-2 Darya Kasatkina (RUS) bt Irina-Camelia Begu (ROM) 4-6, 6-4, 7-6 (7/1) Maria Sakkari (GRE x16) bt Amanda Anisimova (USA) 0-6, 6-1, 6-4 Karolina Muchova (CZE) bt Wang Qiang (CHN) 6-1, 6-3 Naomi Osaka (JPN x2) bt Misaki Doi (JPN) 7-5, 6-2 afp