She beat compatriot Winnie Shaw in the second round and eighth-seeded Julie Heldman in the third to reach the quarterfinal, which she lost in straight sets to second-seeded Rosie Casals.

At Wimbledon she reached the fourth round in singles in 1965 and 1968 in which she was beaten in two sets by fourth-seeded Nancy Richey and eighth-seeded Lesley Bowrey respectively.

In the Grand Slam doubles competition, Williams made it to the semifinals on three occasions: at the U.S. Championships in 1967 with Winnie Shaw and in 1968 with Virginia Wade and at Wimbledon she reached the semifinals in 1972, partnering Shaw, in which they were defeated in three sets by eventual champions Billie-Jean King and Betty Stöve.

Williams competed in the Wightman Cup, a women's team tennis competition between the United States and Great Britain, in 1967, 1970, 1971 and 1972.

During her career, Williams had wins over Margaret Court, Evonne Goolagong, Wade, Ann Haydon-Jones, and Judy Dalton.