Results from Day 5 of the Australian Open at Melbourne Park on Friday: Men's singles 3rd round Grigor Dimitrov (BUL x18) bt Pablo Carreno-Busta (ESP x15) 6-0, 1-0 ret Women's singles 3rd round Hsieh Su-wei (TPE) bt Sara Errani (ITA) 6-4, 2-6, 7-5 Marketa Vondrousova (CZE x19) bt Sorana Cirstea (ROM) 6-2, 6-4 Garbine Muguruza (ESP x14) bt Zarina Diyas (KAZ) 6-1, 6-1 Aryna Sabalenka (BLR x7) bt Ann Li (USA) 6-3, 6-1 Serena Williams (USA x10) bt Anastasia Potapova (RUS) 7-6 (7/5), 6-2 afp