When did Cassius Marcellus Clay fight against Elmo Henderson?
Elmo Henderson:  Despite his dubious claim of a 1972 win against Muhammad Ali in an exhibition match in San Antonio, Texas, he did not become particularly well known in the boxing community; John Spong of the "Texas Monthly" said that the match was the "shot not heard round the world". Muhammad Ali: Muhammad Ali ( ; born Cassius Marcellus Clay Jr.; January 17, 1942 – June 3, 2016) was an American professional boxer and activist.
1972