U of Miami upset of Nebraska in 1984 Orange Bowl
NC State shocking Houston in 1983 NCAA Mens Basketball Championship
Jesse Owens 4 gold medals in 1936 Olympics
Eric Heiden winning every Gold Medal in Speedskating in 1980 Lake Placid Olympics (unfortunately he did that in same Olympics as Miracle on Ice)
Just did not want to repeat many good ones already mentioned
Elvin Hayes and Houston Cougars team beat the Lew Alcindor-led UCLA Bruins on January 20, 1968, in what was known as the Game of the Century.