Caroline Wozniacki overcame Monica Niculescu in straight sets to reach the Qatar Total Open quarter-finals.
The Australian Open champion had to dig deep against the Romanian in the first set, but the second was far easier and she eventually progressed 7-5 6-1.
Angelique Kerber lies in wait after the former world number one recovered to beat Great Britain’s Johanna Konta 1-6 6-1 6-3.
Petra Kvitova racked up a 10th straight win to overcome Elina Svitolina 6-4 7-5, while qualifier CiCi Bellis shocked defending champion Karolina Pliskova.
Australian Open runner-up Simona Halep now lies in wait for the 18-year-old American, while Julia Goerges, Garbine Muguruza and Caroline Garcia are also through.
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here