Annette Van Zyl-Du Plooy, born in September 25, 1943, is a former professional tennis player from South Africa. She used to be World No. 6 and within the top ten women players during the mid-1960s.
In 1965, Zyl was able to reach the semifinals of the Australian Open in Melbourne. She, however, was cut short by Maria Buena of Brazil, 6-2, 6-3, who competed with eventual champion Margaret Smith of the United States.
Her greatest achievement is when she won the Mixed Doubles title during the 1966 French Open with partner Frew McMillan, another tennis player from South Africa. The pair defeated partners Ann Haydon Jones of UK and Clark Graebner of the US in three sets, 1–6, 6–3, 6–2.
In 1967, Zyl was close to winning the championship in the women’s singles and women’s doubles of the 1967 French Open in Paris. In the women’s singles, she able to make it to the semifinals after beating top-seeded Billie Jean King of the United States in three sets, 6-2, 5-7, 6-4. She lost, however, to Lesley Turner of Australia, 6-1, 6-4, who in turn was eventually defeated by Françoise Durr of France. Zyl also made it to the finals of the women’s doubles in the French Open. She and partner Pat Walkden who is also from South Africa, however, lost 6-2, 6-2 to the team of Francoise Durr of France and Gail Sherriff of Australia.
Although Zyl did not land any Grand Slam or any other major title, she was able to reach World No. 6 during her prime years in 1965 and 1966.