Seven players have been forced to pull out of Wimbledon on Wednesday in the most injury-hit second round in the competition's history.
Women's second seed Victoria Azarenka and men's sixth seed Jo-Wilfried Tsonga were among those who withdrew.
Organisers rejected Azarenka's claims that the courts were of poor quality, describing them as "high quality".
But Maria Sharapova, who lost to Michelle Larcher De Brito on court two, referred to the surface as "dangerous".
The 2004 champion fell three times and required lengthy treatment on her hip in the second set as she went out 6-3 6-4.
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