London - Croatian 10th seed Marin Cilic joined the list of Wimbledon's walking wounded on Wednesday when he withdrew with a left knee injury.
Cilic, the runner-up to Andy Murray at Queens last week, was due to face France's Kenny de Schepper for a last-32 place.
Earlier Wednesday, Victoria Azarenka and Steve Darcis withdrew while John Isner and Radek Stepanek both suffered injuries and quit their second round ties.
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