In the fourth round, she defeated qualifier Jennifer Brady in straight sets to advance to the quarterfinals where she pulled another major upset, beating Karolína Plíšková, a heavy favorite to win the tournament in three tight sets where she made her first Australian Open semifinals and her first semifinal appearance since she did so in the 1999 Wimbledon Championships 18 years ago. She then proceeded to lose in two sets against six-time Australian Open champion and No. 2 seed Serena Williams.
In the fourth round, she defeated qualifier Jennifer Brady in straight sets to advance to the quarterfinals where she pulled another major upset, beating Karolína Plíšková, a heavy favorite to win the tournament in three tight sets where she made her first Australian Open semifinals and her first semifinal appearance since she did so in the 1999 Wimbledon Championships 18 years ago. She then proceeded to lose in two sets against six-time Australian Open champion and No. 2 seed Serena Williams.