Christine Marie Evert is an American former professional tennis player. One of the most successful players of all time, she was ranked as the world No. 1 in women's singles by the Women's Tennis Association (WTA) for 260 weeks, and finished as the year-end No. 1 five times: 1975-1977, 1980 and 1981. Evert won 157 singles titles, including 18 majors. Alongside Martina Navratilova, her greatest rival, Evert dominated women's tennis from the mid-1970s to the mid-1980s.