Results from WTA Charleston tournament in South Carolina on Friday (x denotes seed): Quarter-finals Ons Jabeur (TUN x1) bt Nao Hibino (JPN) 6-0, 6-1 Danka Kovinic (MNE) bt Shelby Rogers (USA x3) 7-5, 6-1 Astra Sharma (AUS) bt Linda Fruhvirtova (CZE) 6-4, 6-3 Maria Camila Osorio (COL) bt Clara Tauson (DEN) 6-4, 1-0, retired afp