Christine Marie Evert (born December 21, 1954), known as Chris Evert Lloyd from 1979 to 1987, is an American former world No. 1 tennis player. Evert won 18 major singles titles, including a record seven French Open titles and a joint-record six US Open titles (tied with Serena Williams). Evert was ranked world No. 1 for 260 weeks, and was the year-end world No. 1 singles player seven times (1974–78, 1980, 1981). Alongside Martina Navratilova, her greatest rival, Evert dominated women's tennis for much of the 1970s and 1980s.