Christine O'Neil (born 19 March 1956) is an Australian former professional tennis player.

O'Neil is best known for her singles victory at the 1978 Australian Open, and was the last Australian to win the title until Ashleigh Barty in 2022. She also became the first unseeded woman to win the title in the Open era. O'Neil is also one of the few players who have won both the Australian Open junior (1973) and senior (1978) titles.

In 2007, along with her brothers Keith and William, O'Neil took over the Morisset Sports & Tennis Centre located in Newcastle, New South Wales. The centre was subsequently renamed the O'Neil School of Tennis. She then moved on to operate O'Neil's School of Tennis in Cessnock, New South Wales. She has since moved to Port Macquarie and currently coaches.

Grand Slam finals Singles (1 title) ResultYearChampionshipSurfaceOpponentScoreWin 1978 Australian Open Grass Betsy Nagelsen 6–3, 7–6(7–3)

Grand Slam tournament performance timeline

Singles Tournament 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983Australian Open1R1R2R1R1R AW A A Q22R Q2 1 / 7French Open A Q1 A1R1R1R1R Q22R A1R 0 / 6Wimbledon A3R1R Q32R1R2R Q21R A1R 0 / 7US Open A1R A AA2R2R Q3 A A Q2 0 / 3Strike rate 0 / 1 0 / 3 0 / 2 0 / 20 / 3 1 / 4 0 / 3 0 / 0 0 / 2 0 / 1 0 / 2 Note: The Australian Open was held twice in 1977, in January and December.

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