Venus Williams was the big story of the day, securing her first quarter-finals since the 2010 US Open. The American former world number one booked her spot in the last eight with a 6-3 2-6 6-1 victory over sixth seed Agnieszka Radwanska. The pair fought much of the match from the baseline, but Williams did well to push Radwanska's serve. It looked like Williams had lost momentum in the second set, she bounced back in the third, storming to a 4-1 lead and eventually the win, setting up a match with Madison Keys.
Novak Djokovic booked his place in the Australian Open quarter-finals with an emphatic victory over 6-4 7-5 7-5 victory over Luxemborg's Giles Miller. The Serb is in excellent form and he has reached the last eight without dropping a set.
American teenager Madison Keys has been one of the breakout stars of the Australian open. She booked her place in the quarter-finals with her 6-2 6-4 victory over namesake Madison Brengle. Keys, who is 19-years-old, had no trouble on her way to a meeting with Venus Williams, hitting 38 winners, in the victory.
Japan's Kei Nishikori defeated David Ferrer in straight sets to book his place in the next round. The Japanese star defeated Ferrer 6-3 6-3 6-3, beating him at his own game by winning the long rallies. He took three attempts to win it, but closed out Ferrer with the third match point.
Serena Williams battled her way into the quarter-finals with a 2-6, 6-3, 6-2 win over Garbine Muguruza. Williams, who seemed to be struggling with illness, went a set down before she fought back to set up an appointment with Dominika Cibulkova. The top seed hasn't gone beyond the quarter-finals in the Australian Open since 2010, however, she has won the tournament five times.
Defending champion Stanislas Wawrinka battled past Guillermo Garcia-Lopez with a 7-6(2) 6-4 4-6 7-6(8) victory. Garcia Lopez took advantage in a slip in concentration from the Swiss in the third set, stormed to a 5-0 lead in the fourth-set tiebreak before Wawrinka saved five set points and saved the match.
Dominika Cibulkova, the 2014 losing finalist, defeated double Australian Open champion Victoria Azarenka 6-2, 3-6, 6-3 to book her place in the final. The diminutive Slovaki hit 44 winners and broke former Azarenka's serve seven times as she booked her place in the quarter-finals emphatically.
Canada's Milos Raonic defeated Feliciano Lopez 6-4 4-6 6-3 6-7(7) 6-3 to reach his first Australian Open quarterfinal. Lopez gifted the match to the young challenger when double-faulted in the eighth game of the fifth set to hand Raonic the lead. He didn't hesitate, and won the match on the third match point.
Andy Murray (Britain) v Nick Kyrgios (Australia)
Tomas Berdych (Czech Republic) v Rafael Nadal (Spain)
Novak Djokovic (Serbia) v Milos Raonic (Canada)
Stanislas Wawrinka (Switzerland) v Kei Nishikori (Japan)
Ekaterina Makarova (Russia) v Simona Halep (Romania)
Eugenie Bouchard (Canada) v Maria Sharapova (Russia)
Serena Williams (USA) v Dominika Cibulkova (Slovakia)
Madison Keys (USA) v Venus Williams (USA)