Britain's Emma Raducanu was outclassed by world number five Zheng Qinwen in the quarter-finals at Queen's.
She showed flashes of her quality but ultimately fell 6-2 6-4 to the Olympic champion in front of a packed crowd.
Raducanu took a medical timeout after the first set, having struggled with back spasms over the past few months.
She started the better in the second set and led 3-0 but could not keep Zheng at bay as the Chinese rediscovered her big-hitting form.
Raducanu was given a true physical test by Zheng, but it was another defeat that showed the gap between the British number one and the world's very best.