Fourth seed Agnieszka Radwanska became the first woman to reach this year's Australian Open semi-finals with victory over Carla Suarez Navarro.
The Pole beat the Spanish 10th seed 6-1 6-2 in one hour and 22 minutes.
Radwanska, a Melbourne semi-finalist in 2014, goes on to face top seed and defending champion Serena Williams or fifth seed Maria Sharapova.
In the men's draw, Roger Federer plays Tomas Berdych later on Tuesday before Novak Djokovic takes on Kei Nishikori.