In tennis, only ten women have ever won a career grand slam - ie win all 4 of the tennis Grand Slams (Australian Open, French Open, Wimbledon, US Open).
Maureen Connolly and Doris Hart are long dead. Steffi Graff, Billie Jean King, Margaret Court, Chris Evert, Serena Williams, Martina Navratilova and Maria Sharapova are all well known and would be DLers if their health is ever to fail publicly.
Lesser known in 2020, but still breathing is the tenth person, 1956 Wimbledon champ Shirley Fry, who turned 93 a few months ago and is therefore on the radar of any team wanting to pick a nonagenarian sports star.