Americans Jessica Pegula and Madison Keys lost to Victoria Azarenka and Liudmila Samsonova in the quarterfinals of the German Open on Friday.

Pegula, who beat the fourth-seeded Karolína Plíšková for the fourth time this year on Thursday, was unable to follow up against the seventh-seeded Azarenka, losing 6-2, 5-7, 6-4. The Belarusian was playing her first grass-court quarterfinal since Wimbledon in 2015.

The 106th-ranked Samsonova needed almost 2 1/2 hours to shock Keys 7-6 (4), 2-6, 7-6 (0).

Russias Ekaterina Alexandrowa returns the ball to Switzerland’s Belinda Bencic during they match at the WTA tennis tournament in Berlin, Germany, Friday, June 18, 2021. (Wolfgang Kummdpa via AP)

Russias Ekaterina Alexandrowa returns the ball to Switzerland’s Belinda Bencic during they match at the WTA tennis tournament in Berlin, Germany, Friday, June 18, 2021. (Wolfgang Kummdpa via AP)

Samsonova plays Azarenka in her second career semifinal on Saturday.

Alizé Cornet and Belinda Bencic will meet in the other after coming through third-set tiebreaks in their quarterfinals.

Cornet saved a match point before upsetting the sixth-seeded Garbiñe Muguruza 4-6, 6-3, 7-6 (5), and the fifth-seeded Bencic overcame Ekaterina Alexandrova 6-4, 4-6, 7-6 (4).

CORRECTS NATIONALITY - Switzerland’s Belinda Bencic returns the ball to Russias Ekaterina Alexandrowa during they match at the WTA tennis tournament in Berlin, Germany, Friday, June 18, 2021. (Wolfgang Kummdpa via AP)

CORRECTS NATIONALITY - Switzerland’s Belinda Bencic returns the ball to Russias Ekaterina Alexandrowa during they match at the WTA tennis tournament in Berlin, Germany, Friday, June 18, 2021. (Wolfgang Kummdpa via AP)

It will be the 31-year-old Cornet’s first semifinal on grass.

Bencic is through to her fifth on grass. The Swiss hit nine aces against Alexandrova, who replied with 15 of her own. Bencic won the first two points in the tiebreak and held on to her lead.

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CORRECTS NATIONALITY - Switzerland’s Belinda Bencic returns the ball to Russias Ekaterina Alexandrowa during they match at the WTA tennis tournament in Berlin, Germany, Friday, June 18, 2021. (Wolfgang Kummdpa via AP)

CORRECTS NATIONALITY - Switzerland’s Belinda Bencic returns the ball to Russias Ekaterina Alexandrowa during they match at the WTA tennis tournament in Berlin, Germany, Friday, June 18, 2021. (Wolfgang Kummdpa via AP)