Margaret Osborne duPont

Margaret Osborne duPont (born Margaret Evelyn Osborne; March 4, 1918 – October 24, 2012) was a world No. 1 American female tennis player.

DuPont won a total of 37 singles, women's doubles, and mixed doubles major titles, which places her fourth on the all-time list, despite never entering the Australian Championships. She won 25 of those major titles at the U.S. Championships, which is an all-time record.