GSTAAD, Switzerland — Second-seeded Kiki Bertens beat her doubles partner in the Gstaad Ladies Championship quarterfinals on Friday.

Bertens, ranked No. 35, overcame six double-faults and broke fifth-seeded Johanna Larsson’s serve twice in each set to win 6-4, 6-4.

They were back in action later Friday as the top-seeded pair in the doubles competition at the clay-court event.

Bertens will play unseeded Sara Sorribes Tormo of Spain in the semifinals on Saturday. The 97th-ranked Sorribes Tormo beat Tamara Korpatsch of Germany 6-2, 6-3.

Tereza Martincova of the Czech Republic rallied to beat German qualifier Antonia Lottner 3-6, 6-1, 7-5 to also advance to the semifinals.

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