Emma Raducanu will not play in this week's Berlin Open as she continues to manage a back problem.
The 22-year-old, who will regain her status as British number one on Monday, has been struggling with the issue since competing in Strasbourg last month before the French Open.
The former US Open champion took an off-court medical timeout during her quarter-final loss to Zheng Qinwen at Queen's on Friday.
"It's been lingering for the last few weeks, and I have had back issues before," she said.
"It's just a vulnerability of mine.