Wimbledon champion Simona Halep has retired from the Wuhan Open after suffering a lower back injury.
Despite the intervention of a physiotherapist, she was forced to withdraw when trailing 5-4 in the first set against the Kazakh wildcard.
Meanwhile, Ashleigh Barty defeated Sofia Kenin 6-3, 7-5 to secure a place in the quarterfinals.
Third seed Elina Svitolina also progressed against Svetlana Kuznetsova.

Ireland beat India for first time in international cricket
Usyk vacates titles before 'last dance'
England roar back in second test against New Zealand
Williams to face Australia's Joint in Wimbledon comeback
Australia reach World Cup knockouts, Turkey beat USA
