Results from the WTA tournament in Parma on Thursday (x denotes seeding): Quarter-finals Katerina Siniakova (CZE) bt Caroline Garcia (FRA x8) 7-5, 6-1 Sloane Stephens (USA) bt Sara Errani (ITA) 6-3, 6-0 Coco Gauff (USA x3) bt Amanda Anisimova (USA x5) 6-3, 6-3 Wang Qiang (CHN x6) bt Petra Martic (CRO x2) 7-6 (7/4), 3-6, 7-5 afp