Wimbledon champion Marketa Vondrousova has suffered an injury scare less than a fortnight before her title defence is due to start.
The Czech slipped and fell when leading 5-3 in the first set of her second-round match against Anna Kalinskaya at the Berlin Open.
Vondrousova clutched her right hip and called for a medical time-out before retiring two games later, with the score at 5-5.
Wimbledon takes place from 1-14 July, with Vondrousova set to start her title defence on the second day
The 24-year-old became the first unseeded player to win the Wimbledon women's singles title when she beat Ons Jabeur in the final.