Aryna Sabalenka and Ons Jabeur became the latest Wimbledon contenders to retire early from matches in the lead up to the Grand Slam tournament.
World number three Sabalenka appeared to struggle with a shoulder injury and retired while trailing 5-1 in her Berlin Open quarter-final against Anna Kalinskaya.
Two-time Wimbledon finalist Jabeur decided not to continue because of illness after dropping the first set 7-6 (11-9) to Coco Gauff.
Reigning Wimbledon champion Marketa Vondrousova and 2022 winner Elena Rybakina also retired from their matches earlier in the tournament.
The first round of the women's singles at Wimbledon starts on 1 July.