Top-seeded Jessica Pegula survived four match points to battle past 12-seeded Victoria Azarenka 6-4, 3-6, 7-6 (7) on Friday in the quarterfinals of the Credit One Charleston (S.C.) Open.

Azarenka of Belarus also saved four match points but committed 12 double faults to none for Pegula, a top seed for only the sixth time in her career.