Maria Sakkari claimed the scalp of top seed Elina Svitolina to reach the quarter-finals of the Ostrava Open on Wednesday.
Sakkari beat world number five Svitolina 6-3 6-3 to progress to the last eight of a WTA Premier event for the third time this season.
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Unseeded Greek Sakkari struck 32 winners and returned superbly, winning all but eight of 29 points on Svitolina's second serve.
The 23rd-ranked Sakkari will face either wildcard Jelana Ostapenko or Ons Jabeur for a place in the semi-finals.
rd quarterfinal of the season! @mariasakkari upsets the No. 1 seed Svitolina, 6-3, 6-3.#jtbankaostravaopen pic.twitter.com/OhqnNp63PV
— wta (@WTA) October 21, 2020
Ostapenko knocked out fifth seed Petra Martic, the 2017 French Open champion easing to a 6-3 6-1 victory.
Martic had won their previous two meetings, but the Croatian was beaten in just 57 minutes at the indoor hard-court event.
Anett Kontaveit was another seed to fall, Sara Sorribes Tormo reaching a maiden Premier-level quarter-final at the expense of the Estonian with a 6-1 6-4 success.
Victoria Azarenka is also two wins away from the final, coming from a set down to see off Barbora Krejcikova 2-6 6-2 6-1, and will now face Karolina Muchova or Elise Mertens, who got past Amanda Anisimova in straight sets.
