Evert's career winning percentage in singles matches of 90.05% (1309--145) is the second best in the history of professional tennis, man or woman, after Margaret Court's 91.37% (593--56) in the Open Era.
Evert's career winning percentage in singles matches of 90.05% (1309--145) is the highest in the history of Open-Era professional tennis, man or woman. There is an unofficial (non-verified by the WTA or ITF) winning percentage held by Margaret Court that is higher, at 91.37% (593--56) in the Open Era.