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.
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.
