Serena Williams was dumped out of the Australian Open semi-finals on Wednesday as Karolina Pliskova saved four match points in a remarkable comeback win.

Having trailed by a set and a break, Williams looked to have powered her way out of trouble when she moved 5-1 ahead in the deciding set.

But, incredibly, Pliskova won six games in a row to set up a last-four clash with Naomi Osaka, saving one match point at 5-1 and three more at 5-4 to win 6-4 4-6 7-5 and reach her first semi-final in Melbourne.

Meanwhile, Osaka extended her winning Grand Slam run to 12 matches with a dominant victory over Elina Svitolina.

The US Open champion has taken the increase in expectation and attention in her stride and needed only an hour and 12 minutes to wrap up a 6-4 6-1 win against the sixth seed.