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Even at a combined age of 90, opponents should still be wary of facing the Williams sisters at Wimbledon.
Serena and Venus Williams won a combined 21 titles on the storied grass of the All England Club in their singles and doubles careers and now they're going for one more.
A doubles wild card invitation for the sisters was announced on Tuesday by organizers of Wimbledon, which starts in less than two weeks.
The move comes after 44-year-old Serena recently returned to competition after nearly four years away from professional tennis.