Cincinnati - World No 1 Serena Williams eased past Italy's Flavia Pennetta 6-2, 6-2 to reach the Cincinnati WTA quarter-finals on Thursday.
She will face fellow American Sloane Stephens or Serbia's Jelena Jankovic for a place in the semi-finals.
Men
3rd rd
Stanislas Wawrinka (SUI x3) bt Marin Cilic (CRO x14) 3-6, 6-0, 6-1
Julien Benneteau (FRA) bt Jerzy Janowicz (POL) 7-5, 6-1
Fabio Fognini (ITA x15) bt Lu Yen-Hsun (TPE) 3-6, 6-3, 6-3
Andy Murray (GBR x8) bt John Isner (USA) 6-7 (3/7), 6-4, 7-6 (7/2)
Women
3rd rd
Serena Williams (USA x1) bt Flavia Pennetta (ITA x13) 6-2, 6-2
Elina Svitolina (UKR) bt Carla Suarez Navarro (ESP x15) 4-6, 6-4, 6-4
Simona Halep (ROM x2) bt Lucie Safarova (CZE x16) 6-4, 7-5