Results from the WTA Dubai Open on Thursday (x denotes seeding): Quarter-finals Barbora Krejcikova (CZE) bt Anastasia Potapova (RUS) 6-0, 6-2 Jil Teichmann (SUI) bt Coco Gauff (USA) 6-3, 6-3 Garbine Muguruza (ESP x9) bt Aryna Sabalenka (BLR x3) 3-6, 6-3, 6-2 Elise Mertens (BEL x10) bt Jessica Pegula (USA) 5-7, 7-5, 6-0 afp