Jack Roosevelt "Jackie" Robinson (January 31, 1919 – October 24, 1972) was the first African American Major League Baseball (MLB) player of the modern era.
http://en.wikipedia.org/wiki/Jackie_Robinson
Matthew "Mack" Robinson(July 18, 1912 – March 12, 2000) was an American athlete, setting a world record and winning a silver medal in the Olympics. He was the older brother of Baseball Hall of Fame member Jackie Robinson.
http://en.wikipedia.org/wiki/Matthew_Robinson_(athlete)