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 Grand Slam titles. She won 25 of her Grand Slam titles at the U.S. Championships, which is an all-time record. He was born in Joseph, Oregon.