Emma Raducanu's Wimbledon preparations have suffered a blow as she was forced to retire from her Nottingham Open opener against Viktorija Golubic.
The 19-year-old US Open champion took a medical timeout early in the first set because of a problem to her left side.
However, despite treatment and a dose of painkillers, she conceded the match shortly after Swiss Golubic moved 4-3 up with a break of serve.
It is Raducanu's third mid-match retirement since her 2021 US Open win.
The British world number 11 also bowed out of matches in Guadalajara in February and Rome in May with injuries.