After a slow start, second seed Naomi Osaka quickly found her range to overcome Misaki Doi at the Madrid Open.
Ash Barty bangkit daripada ketinggalan buat kali ketiga minggu ini selepas pemain nombor satu dunia itu meneruskan musim 2021 dengan cemerlang apabila menjuarai Terbuka Stuttgart.
Ash Barty and Simona Halep are on course to meet in the Stuttgart Open final after both reached the tournament's semi-finals on Friday.
Pemain nombor satu dunia, Ash Barty, berjaya memastikan kemaraan ke separuh akhir Terbuka Stuttgart dengan kemenangan 2-6, 6-1, 7-5 ke atas Karolina Pliskova.
Second seed Naomi Osaka benefited from a walkover after Nina Stojanovic withdrew ahead of Sunday's clash due to a right thigh injury.
After losing out to Aryna Sabalenka in the final last year, Petra Kvitova is edging closer to a second title at the Qatar Open.
Aryna Sabalenka's hopes of retaining her Qatar Open title are over, but the top two seeds remain alive in the draw.
Karolina Pliskova took out her frustrations during a third-round defeat, but Ash Barty was able to reach week two in Melbourne.
On another warm day in Melbourne, there were contrasting results for star duo Sofia Kenin and Ash Barty in the second round.
Garbine Muguruza and Sofia Kenin reached the second round, while Victoria Azarenka bowed out of the Australian Open.