World No. 1 tennis player for much of the 1940s; considered one of the best to ever play the sport.
He gave up playing basketball after watching Ellsworth Vine play.
He came out with his own line of Jack Kramer Autograph tennis rackets, which were best sellers for more than 30 years.
He fathered five sons with his wife, Gloria.
He lost a match in the junior leagues to Arthur Marx, the son of Groucho Marx.