Serena said she injured her knee during her singles comeback match on Centre Court against Australia's Maya Joint.

Serena received wild card invitations from Wimbledon organizers to play both singles and doubles with Venus.

Serena Williams, 44, did not ask for medical treatment during a 6-3 6-7 (6) 6-3 loss to 20-year-old Maya Joint of Australia in the first round on Tuesday. | Tennis News