World number two Simona Halep and world number four Petra Kvitova booked their places in the quarterfinals of the Dubai Duty Free Tennis Championships with contrasting wins on Wednesday, but fifth seeded German Angelique Kerber lost her third round match.

Halep, who beat 2014 Wimbledon runner-up Eugenie Bouchard of Canada 7-6, 6-4 on Tuesday, registered another straight set win on Centre Court.

The reigning French Open champion beat Ukrainian Lesia Tsurenko 6-3, 7-5.

Tsurenko was serving for the second set at 5-4, but the Romanian broke back and went on to win the next two games, finishing the match in style.

Kvitova, on the other hand, beat American qualifier Jennifer Brady 7-5, 1-6, 6-3 in the first match of the day on the Centre Court.

It wasn't the perfect match for the 28-year-old Czech player who once again struggled with her serve, making 10 double faults.

"Definitely it's a relief right now," Kvitova, said after her match on Wednesday. Kvitova also won a three-setter in the second round against compatriot Katerina Siniakova on Tuesday.

"I tried to be quicker today than yesterday. I did little bit better, but still was pretty tough. The wind was just terrible today, to be honest. It was really difficult to kind of find a way with it. I couldn't really serve well today at all."

Taiwan's Su-Wei Hsieh stunned three-time Grand Slam champion Kerber 5-7, 6-4, 6-0 in their third round match on Court One.

It was the 33-year-old Hsieh's first win over Kerber in three attempts.

Halep, Kvitova and Hsieh were joined in the Dubai quarterfinals by Viktoria Kuzmova.

The Slovakian also needed three sets to beat Sofia Kenin of the US 1-6, 7-5, 6-2 on Court One.

Meanwhile, Frenchwoman Kristina Mladenovic, who stunned world number one Naomi Osaka in the second round on Tuesday, lost her third round match to Spaniard Carla Suarez Navarro (5-7, 5-7).