Britain's Emma Raducanu has withdrawn from the Miami Open on the eve of her first-round match due to a lower back injury, according to multiple reports.
The former US Open champion missed most of last season after undergoing surgeries on her ankle and both wrists.
Raducanu, 21, was looking to build on her performance at Indian Wells, where she played well but lost in the third round to world No. 2 Aryna Sabalenka last week.
Raducanu received a wild card into the main draw at the Miami Open and was scheduled to face China's Wang Xiyu in their first-round match Tuesday.
Raducanu, who in 2021 became the first qualifier to win the US Open, is scheduled to play in Britain's Billie Jean King Cup tie against France next month.
Reuters contributed to this report.