Gregory Mangin
Gregory Sylvester Mangin was an American tennis player and Wall Street broker. He won four U.S. Indoor singles titles in the 1930s.
Early life and education
Mangin was born in Newark, New Jersey. All four of his grandparents were born in Ireland.He was educated at Georgetown University and learned lawn tennis in Montclair, New Jersey.
Tennis career
In 1931, Mangin and Berkeley Bell were runners-up in the doubles final of the U.S. National Championships in Brookline, Mass., losing in straight sets to compatriots John Van Ryn and Wilmer Allison.Mangin won the singles title at the U.S. Indoor Championships, held at the Seventh Regiment Armory in New York, in 1932, 1933, 1935 and 1936. He was a member of the US Davis Cup teams in 1930 and 1931 but did not play any matches.
Military service
During WWII Mangin enlisted in the United States Army Air Forces. He became a tail gunner on the B-17 Flying Fortress and flew 50 missions over Europe. He was wounded twice in missions over Italy and France, and shot down two Bf 109s in a mission over Germany. Reaching the rank of staff sergeant, he received the Distinguished Flying Cross, the Air Medal with six clusters, and a Purple Heart with one cluster.Grand Slam finals
Doubles (1 runner-up)
| Outcome | Year | Championship | Surface | Partner | Opponents | Score |
| Runner-up | 1931 | U.S. National Championships | Grass |  Berkeley Bell | John Van Ryn  Wilmer Allison | 4–6, 3–6, 2–6 |