 She was ranked second in the United States six times behind the world's dominant women's player of the era Judy Devlin Hashman, and was repeatedly ranked in the top three nationally in women's doubles.She co-ranked first with partner Rosine Lemon in 1972.In international events, O'Neil won the Mexican Open Singles in 1965 and competed for the United States in the World Team Championships for Women, also known as the Uber Cup, including the World Champion US teams of 1960 and 1963.. She also played on the 1969 Uber Cup team and was captain of the team in 1972.