Australian Open results

Melbourne, Jan 20 (AFP) Collated results from Day 7 of the Australian Open on Sunday: Men's singles, 4th round

Frances Tiafoe (USA) bt Grigor Dimitrov (BUL x20) 7-5, 7-6 (8/6), 6-7 (1/7), 7-5 Rafael Nadal (ESP x2) bt Tomas Berdych (CZE) 6-0, 6-1, 7-6 (7/4) Roberto Bautista Agut (ESP x22) bt Marin Cilic (CRO x6) 6-7 (6/8), 6-3, 6-2, 4-6, 6-4 Stefanos Tsitsipas (GRE x14) bt Roger Federer (SUI x3) 6-7 (11/13), 7-6 (7/3), 7-5, 7-6 (7/5) Women's singles, 4th round

Petra Kvitova (CZE x8) bt Amanda Anisimova (USA) 6-2, 6-1 Ashleigh Barty (AUS x15) bt Maria Sharapova (RUS x30) 4-6, 6-1, 6-4 Danielle Collins (USA) bt Angelique Kerber (GER x2) 6-0, 6-2 Anastasia Pavlyuchenkova (RUS) bt Sloane Stephens (USA x5) 6-7 (3/7), 6-3, 6-3. (AFP) AT AT