Aryna Sabalenka stunned defending champion and former world number one Karolina Pliskova to reach the semi-finals at Eastbourne.
Seventh-ranked Pliskova fell 6-3 2-6 7-6 (7-5) to the Belarusian at the Nature Valley International.
World number 45 Sabalenka trailed 1-4 in the final set but rallied, hitting a total of 40 winners to secure victory.
Elsewhere, top seed Caroline Wozniacki registered a 6-4 6-3 victory over Australia's Ashleigh Barty.
Wozniacki, the world number two, will play either Germany's Angelique Kerber or Daria Kasatkina of Russia in the final four.
Pliskova of the Czech Republic struggled for consistency in the first set but recovered in the second, improving her first serve percentage to 83%.