In Federation Cup finals, she was on the winning United States team seven times, in 1963, 1966, 1967, and 1976 through 1979. Her career win–loss record was 52–4. She won the last 30 matches she played, including 15 straight wins in both singles and doubles. In Wightman Cup competition, her career win–loss record was 22–4, winning her last nine matches. The United States won the cup ten of the 11 years that she participated. In singles, King was 6–1 against Ann Haydon-Jones, 4–0 against Virginia Wade, and 1–1 against Christine Truman Janes.