Four Grand Slam champions- Roger Federer, Marin Cilic, Maria Sharapova and Angelique Kerber were knocked out on Sunday in the round of 16 at the Australian Open (AO).
Wimbledon champion Angelique Kerber was knocked out of the Australian Open by world number 35 Danielle Collins in the biggest shock of the tournament.
The world number two was thrashed 6-0, 6-2 in the fourth round in 56 minutes.
Defending champion Roger Federer is out of the Australian Open after Greek 14th seed Stefanos Tsitsipas earned the biggest win of his career to reach the quarter-finals.
The Swiss lost 6-7 (11-13,) 7-6 (7-3,) 7-5, 7-6 (7-5) on a dramatic night.
Home favourite Ashleigh Barty won nine games in a row to inspire a comeback against Maria Sharapova and book her place in the Australian Open quarter-finals.
Having lost the first set, Barty broke twice in the second and went on to win 4-6 6-1 6-4 to reach the last eight of a Grand Slam for the first time.
Sixth-seed Marin Cilic was beaten by number 22 Roberto Bautista Agut 7-6 (8-6), 3-6, 2-6, 6-4, 4-6.
Source: BBC, Australian Open official website
