KUALA LUMPUR, Malaysia – Elina Svitolina booked her place in the quarterfinals of the BMW Malaysian Open with a topsy-turvy win over qualifier Risa Ozaki on Thursday evening.

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After breezing through her opening match, Svitolina, the No.2 seed, seemed on course for another routine victory when she took a one-sided opening set.

However, in the end she was made to sweat – by both Ozaki and the Malaysian capital’s humidity – before running away with the match, 6-1, 3-6, 6-0.

Struggling with a preexisting back problem, Svitolina lost a series of tit for tat games to drop the second set to her unheralded opponent. A visit from the trainer helped alleviate her discomfort and refocus the mind as the Ukrainian nipped the potential upset in the bud.

“My back was a bit sore. I had an injury at the Australian Open so I need to take care of it and that’s why today I was worrying a bit about my back,” Svitolina said. “After the timeout I came out strong and was playing great and playing my game. So I’m really happy and it was good that I came back strong.

“I was a little bit injured, a little bit off my game. But she started playing well and that’s why I was a little bit struggling. All the games were advantage, deuce, advantage, deuce, so it was just a few points the difference. But this happens sometimes so I was just trying to be focused – and of course the conditions were not easy, too.”

Also advancing in Svitolina’s half of the draw was qualifier Zhu Lin, a 7-5, 6-2 winner over Zarina Diyas.

In the top half, there was success for a couple more unseeded players, Naomi Broady and Cagla Buyukakcay. Broady beat Yang Zhaoxuan, 6-4, 6-3, while Buyakakcay defeated top seed Roberta Vinci’s conqueror, Chang Kai-Chen, 7-5, 6-3.