DOHA, Qatar – Andrea Petkovic played some of her best tennis of the year to maintain a perfect head-to-head record against No.4 seed Garbiñe Muguruza, winning 6-1, 5-7, 6-2 to reach the semifinals of the Qatar Total Open.

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“It’s very special,” Petkovic said of her first Top 5 win in three years. “It was so tough; Garbiñe is such a talented and dangerous player who put me under pressure.

“I was a little lucky in the end, but I’m just happy to be through.”

Each woman hit 29 winners, but while the German played cleanly throughout – hitting just 16 unforced errors – Muguruza had more issues with consistency, hitting 38.

“I’ve been playing really well the past few weeks. Everything is coming together and I’m getting my match focus again,” Petkovic continued.

“I’m really happy I’m on the right path and really looking forward to the whole season.”

Up next for the former World No.9 is teen sensation Jelena Ostapenko, who dispatched China’s Zheng Saisai in the first quarterfinal of the day.

“I watched both of her matches, and she’s been playing great. I had her on the radar, before. I saw her in Linz qualifying and thought this girl is really good.

“She’s showing her talent, and hopefully I can recover well from today’s match and put on a good performance tomorrow.”