In round 13 of a boxing match at New York City's Madison Square Garden, Primo Carnera knocks out Ernie Schaaf. Schaaf dies four days later.

Boxing is a combat sport and martial art. Taking place in a boxing ring, it involves two people – usually wearing protective equipment, such as protective gloves, hand wraps, and mouthguards – throwing punches at each other for a predetermined amount of time.

Madison Square Garden was an indoor arena in New York City, the third bearing that name. Built in 1925 and closed in 1968, it was located on the west side of Eighth Avenue between 49th and 50th streets in Manhattan, on the site of the city's trolley-car barns. It was the first Garden that was not located near Madison Square. MSG III was the home of the New York Rangers of the National Hockey League and the New York Knicks of the National Basketball Association, and also hosted numerous boxing matches, the Millrose Games, the National Invitation Tournament, Ringling Bros. and Barnum & Bailey, concerts, and other events. In 1968 it was demolished and its role and name passed to the fourth Madison Square Garden, which stands at the site of the original Penn Station. One Worldwide Plaza was built on the arena's former 50th Street location.

Primo Carnera The Ambling Alp and The Monster was the first Italian Heavyweight Champion boxer, holding the title from 1933-1934. Best known for his immense size, and status as one of the most physically imposing heavyweights in boxing history. Standing 6 feet 7 inches tall and weighing more than 270 pounds during his prime, Carnera became the World Heavyweight Champion in 1933 after defeating Jack Sharkey by knockout.

Frederick Ernest Schaaf was a professional boxer who was a heavyweight contender in the 1930s but died after a bout.