Jan 11 (OPTA) - Results from the WTA Premier, Brisbane Women's Singles matches on Friday .. Quarter-final .. 5-Petra Kvitova (CZE) beat Jennifer Brady (USA) 6-4 6-2 8-Madison Keys (USA) beat Danielle Collins (USA) 6-4 6-1 3-Naomi Osaka (JPN) beat 6-Kiki Bertens (NED) 6-3 3-6 6-3 2-Karolina Pliskova (CZE) beat Alison Riske (USA) 7-6(6) 6-3