Results from the WTA Dubai Open on Tuesday (x denotes seeding): Barbora Krejcikova (CZE) bt Jelena Ostapenko (LAT) 6-3, 6-1 Anastasia Potapova (RUS) bt Madison Keys (USA x11) 6-4, 6-3 Belinda Bencic (SUI x6) bt Veronika Kudermetova (RUS) 6-4, 5-7, 6-4 Cori Gauff (USA) bt Marketa Vondrousova (CZE x12) 3-6, 6-0, 6-4 Karolina Pliskova (CZE x2) bt Anastasija Sevastova (LAT) 6-3, 6-7 (5/7), 6-2 Tereza Martincova (CZE) bt Kiki Bertens (NED x5) 6-1, 6-4 Anett Kontaveit (EST x15) bt Sorana Cirstea (ROM) 6-4, 7-5 Aryna Sabalenka (BLR x3) bt Alize Cornet (FRA) 6-2, 6-4 Caroline Garcia (FRA) bt Martina Trevisan (ITA) 6-2, 6-4 Jessica Pegula (USA) bt Kristina Mladenovic (FRA) 6-1, 6-2 afp