Results on Friday in the WTA clay court tournament in Charleston, South Carolina (x-denotes seeded player): Quarter finals Paula Badosa (ESP) bt Ashleigh Barty (AUS x1) 6-4, 6-3 Danka Kovinic (MNE) bt Yulia Putintseva (KAZ x11) 6-7 (2/7), 7-5, 6-1 Ons Jabeur (TUN x12) bt Cori Gauff (USA x14) 6-3, 6-3 afp