George Diehl Mateer Jr. (born June 4 1928) is an American hardball squash player. He was one of the leading squash players in the United States in the 1950s and 1960s. He is the only amateur player to have won 2 US Open squash titles (in 1955 and 1959). He also won 3 US national singles titles between 1954 and 1960, and a record 11 US national doubles titles between 1949 and 1966. He was runner-up at the US national doubles championship on 9 further occasions (3 of those times with his his son Gil – his boys Gil and Drew won 5 national titles in all, including once together in 1986). Diehl also won 2 intercollegiate titles. Mateer was inducted into the United States Squash Racquets Association Hall of Fame in 2000, the initial year. He is also a member of the US Intercollegiate Hall of Fame, the Episcopal Academy Hall of Fame and the Maryland Squash Hall of Fame.
