Britain's Emma Raducanu has withdrawn from this week's Miami Open in the United States.
The 21-year-old, who is continuing her comeback from an injury-disrupted 2023 season, is reportedly suffering from a lower back issue.
Raducanu was due to play China's Wang Xiyu in the first round on Tuesday.
She was beaten in straight sets by Belarusian world number two Aryna Sabalenka in the third round at Indian Wells last week.
It is not known how serious Raducanu's injury is, or whether it will impact her selection in Great Britain's Billie Jean King Cup squad for their qualifying-round tie with France from 12-13 April.