Margaret Court AC MBE (née Smith; born 16 July 1942), also known as Margaret Smith Court, is an Australian retired tennis player and former world No. 1. Considered one of the greatest tennis players of all time, her 24 major singles titles and total of 64 major titles (including 19 Grand Slam women's doubles and 21 Grand Slam mixed doubles titles) are the most in tennis history, but not in the Open era, when everyone played the same format and everyone was allowed to play. She is currently a Christian minister in Perth, Western Australia.
In 1970, Court became the first woman during the Open Era (the second woman in history after Maureen Connolly) to win the singles Grand Slam (all four major tournaments in the same calendar year). Her all-surfaces (hard, clay, grass and carpet) singles career-winning percentage of 91.74 is the best of all time according to the Sporteology website. Her Open era singles career winning percentage of 91.02% (608–60) is unequalled, as is her Open era winning percentage of 91.67% (11–1) in Grand Slam singles finals. Her win–loss performance in all Grand Slam singles tournaments was 90.00% (207–23). She was 95.24% (60–3) at the Australian Open, 89.80% (44–5) at the French Open, 85.00% (51–9) at Wimbledon, and 89.66% (52–6) at the US Open. She also shares the Open era record for most Grand Slam singles titles as a mother (3) with Kim Clijsters. In 1973, Court set the record for most singles titles won in a single Grand Slam event, with 11 Australian Open wins. This record was surpassed by Rafael Nadal in 2019 when he won his 12th French Open title, but remains a women's record.