Anna Kournikova is in doubt for Wimbledon following her withdrawal from this week's grasscourt WTA tournament in Birmingham and the Eastbourne championships next week with a "chronic lumbar complaint."
The 22-year-old Russian had been due to play Madagascar's Dally Randriantefy in the first round in Birmingham on Tuesday.
Kournikova has been plagued with injuries over the past two seasons and has not played on the WTA Tour since April's Family Circle Cup in Charleston, South Carolina, when she was forced to retire from her first-round match with a thigh strain.
Last month, she tried to rebuild her confidence on the lower ITF Women's Circuit tournaments following four first-round defeats in the five WTA tournaments she has played this year, but injuries once again hindered her progress.
Now ranked a lowly 77th, Kournikova is no longer considered a serious title contender on the WTA tour but remains the most photographed woman in sport.