Jessica Pegula got the better of Karolina Pliskova once again as she knocked the fourth seed out of the bett1open on Thursday.
The American beat the former world number one 7-5 6-2 in Berlin, setting up a quarter-final clash with Victoria Azarenka.
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It is the fourth time this season Pegula has defeated Pliskova.
Azarenka was also a straight-sets winner, overcoming Angelique Kerber in a battling 6-3 7-5 victory.
The two-time Australian Open champion was 4-1 down in the second set but roared back to prevail over Kerber for the 10th time in 11 matches.
Azarenka advances!
— wta (@WTA) June 17, 2021
@vika7 knocks out another home favorite to reach the last eight in Berlin.#bett1open pic.twitter.com/T2ytIvyESj
Garbine Muguruza enjoyed a 6-4 6-3 victory over Elena Rybakina and will take on Alize Cornet next, while Ludmilla Samsonova downed Veronika Kudermetova by the same scoreline and will now face Madison Keys.
