Petra Kvitova claimed her second Qatar Open title in her third final in four years with a 6-2 6-1 win over Garbine Muguruza.
Victoria Azarenka's back injury allowed Garbine Muguruza to progress to the Qatar Open final, where Petra Kvitova awaits.
Aryna Sabalenka's hopes of retaining her Qatar Open title are over, but the top two seeds remain alive in the draw.
There were wins for Victoria Azarenka, Garbine Muguruza and Jelena Ostapenko in the first round of the Qatar Open.
Serena Williams and Simona Halep will meet in the quarter-finals, while Naomi Osaka also advanced at Melbourne Park.
Naomi Osaka was all smiles after progressing to the quarter-finals at Melbourne Park on Sunday.
Naomi Osaka, Garbine Muguruza and Serena Williams advanced on a good day for the women's seeds at the Australian Open.
On a scorching Melbourne day, Serena Williams and Naomi Osaka kept their cool to make round three of the Australian Open.
Garbine Muguruza and Sofia Kenin reached the second round, while Victoria Azarenka bowed out of the Australian Open.
Ash Barty – gearing up for the year's first grand slam which gets underway in Melbourne on Monday – clinched her ninth WTA Tour title.