Jack Kramer, American tennis player and sportscaster (b. 1921)
John Albert Kramer (August 1, 1921 – September 12, 2009) was an American tennis player of the 1940s and 1950s. A world No. 1 player for 1946 and 1947 as an amateur and in 1948 as a professional in contemporary rankings. Kramer was one of the most important people in the establishment of modern men's "Open"-era tennis, and was the leading promoter of professional tennis tours in the 1950s and 1960s.