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At least six Grand Slam titles across all disciplines in a year
In 1965 Margaret Court won a record nine titles out of twelve available to a player in the same year: the singles, doubles and mixed doubles at all four Grand Slam tournaments. In 1985 Martina Navratilova reached Finals in all Grand Slam events held that year, equaling the record of eleven final appearances set by Court in 1963 and repeated a year later.

Only twelve unique players - nine women and three men - have won at least six major championships in one calendar year.

1 Margaret Court's 1965 and 1969 Australian mixed doubles titles were unplayed finals.
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Men

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