Seven-time major winner John McEnroe was forthright in his assessment of Serena Williams' failure to see off Karolina Pliskova in Melbourne.
Karolina Pliskova stunned Serena Williams in an incredible Australian Open quarter-final.
We take a closer look at how Karolina Pliskova rallied past Serena Williams in the Australian Open quarter-finals.
A delighted Karolina Pliskova said her comeback against Serena Williams at the Australian Open was her best.
Serena Williams said Karolina Pliskova played "lights out" when down match points in their quarter-final.
With the world number one knocked out in Melbourne, four players are in contention to take over at the summit of the WTA rankings.
The dramatic scenes at last year's US Open did not leave Patrick Mouratoglou fearful that he would lose his role as Serena Williams' coach.
Simona Halep took the positives from her Australian Open performance after Serena Williams knocked her out in the fourth round.
Simona Halep pushed Serena Williams all the way in a gripping fourth-round contest, but the 23-time major champion came out on top.
Top seed Simona Halep pushed Serena Williams all the way, but the 23-time major singles champion moved into the last eight in Melbourne.