"Even if you win with an easy score, if you lead many games ahead, it's not about that you already won the match, so you have to stay focused on every ball and every point. At this level, no one gives up at the beginning. You have to stay there for everything and to give everything at every moment," said Halep.

"It was not that easy as the score shows. She's a tough opponent. I had to pay attention to every ball that we played," the Romanian added.

Halep will take on Angelique Kerber in the quarterfinals. The German saw off home favorite Caroline Garcia 6-2, 6-3.