Former French Open champion Jelena Ostapenko completed the second round lineup in the Czech event in Ostrava on Wednesday, running down Croatian fifth seed Petra Martic 6-3, 6-1.
Ostapenko, playing on a wild card entry, ended a two-match loss streak to Martic .
The 2017 Roland Garros winner, ranked 44th, took victory in just under an hour indoors, producing 30 winners to 15 unforced errors .
Martic limited her errors to 15 but could find a mere nine winners; Ostapenko next plays Ons Jabeur of Tunisia.
Greek Maria Sakkari accounted for top seed Elina Svitolina 6-3, 6-3, with the Ukrainian 6-3, 6-3 losing serve five times in just over an hour.
Former No. 1 Victoria Azarenka took two and a quarter hours to go through for a 2-6, 6-2, 6-1 comeback win into the quarters over Czech Barbora Krejcikova, ranked 85th.
Fourth seed Azaranka fired six aces while breaking the local four times.