Maria Sakkari of Greece competes during the women's third round match between Ashleigh Barty of Australia and Maria Sakkari of Greece at the 2019 Australian Open in Melbourne, Australia, Jan. 18, 2019. (Photos: Xinhua)

Ashleigh Barty of Australia celebrates during the women's third round match between Ashleigh Barty of Australia and Maria Sakkari of Greece at the 2019 Australian Open in Melbourne, Australia, Jan. 18, 2019.

Ashleigh Barty of Australia competes during the women's third round match between Ashleigh Barty of Australia and Maria Sakkari of Greece at the 2019 Australian Open in Melbourne, Australia, Jan. 18, 2019.

Ashleigh Barty of Australia competes during the women's third round match between Ashleigh Barty of Australia and Maria Sakkari of Greece at the 2019 Australian Open in Melbourne, Australia, Jan. 18, 2019.

Ashleigh Barty of Australia competes during the women's third round match between Ashleigh Barty of Australia and Maria Sakkari of Greece at the 2019 Australian Open in Melbourne, Australia, Jan. 18, 2019.

Ashleigh Barty of Australia celebrates during the women's third round match between Ashleigh Barty of Australia and Maria Sakkari of Greece at the 2019 Australian Open in Melbourne, Australia, Jan. 18, 2019.