STUTTGART, Germany – Angelique Kerber continued the defense of her Porsche Tennis Grand Prix title with a straight set victory over Carla Suárez Navarro in Friday’s quarterfinals.

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Since lifting her maiden major at this January’s Australian Open, Kerber has taken some time to get used to life with a target on her back. But following a couple of early exits, the German appears to have found her stride on clay, all the more impressive given the difficulty several of her peers have encountered at the Porsche Arena.

Against Suárez Navarro, one of the game’s most surefooted clay courters, she was particularly impressive, flying out of the traps, then overcoming a late wobble to close out a 6-2, 6-4 victory.

“I think it was a good match from me, a good performance,” Kerber said. “I know how Carla is playing and she is one of the best players on clay. I was trying to go for it, trying to play aggressive tennis. I knew this is the only way to beat her today and I think I did a great job.”

Although Kerber held the edge in previous matches with the Spaniard, she had lost their only tussle on the dirt. This came two years in Stuttgart and provided a source of inspiration during the rematch: “I knew that she beat me here two, three years ago. So, I was trying to take revenge! And I think it was a good match today.”

Taking the initiative from the off, a smart volley and a trademark passing shot saw Kerber break immediately for a 2-0 lead. She bookended the set with a second break, then took total control of the match with a rasping forehand drive to open up a 4-2 lead in the second.

The procession was momentarily halted when the Spaniard broke back in the ninth game, only for Kerber to batten down the hatches once more to wrap up victory the following game.

“But at the end of the second set it was still close and I know that against her I must play until the last ball because she is always tough and she’s fighting as well. So, I went out trying to take my revenge and play good tennis and beat her here,” Kerber added.

In the last four Kerber faces Petra Kvitova, who won a see-saw encounter with Garbiñe Muguruza, 6-1, 3-6, 6-0.