The first time the word 'Jazz' appeared in print in 1913, it did not refer to music but to an enthusiastic sportsman. What sport was he playing ?

It is commonly accepted among scholars that jazz in the early 1900s referred to sexual intercourse, although no concrete documentation of its use in this sense has turned up. The word appeared in print for the first time in 1913, when it was mentioned rather innocently by an editor of the San Francisco Call, a black-owned newspaper. It caught on as a musical label when the Original Dixieland Jass Band, a white group, used it on the first 'jass' record in 1917...Jass has also been identified as an Elizabethan slang term meaning 'to do things with gusto and enthusiasm.'

https://en.wikipedia.org/wiki/Jazz_(word)#Likely_derivation_from_jasm
But, nobody is exactly sure where the word 'jazz' itself comes from. Some sources say it is West African, and others suggest it may be derived from the New Orleans French 'jaser'--meaning more or less to chatter with one another. According to Yale University's Frank Tirro, the word first appeared in print in 1913 in the San Francisco Bulletin, to describe a group of musicians trained in ragtime and 'jazz.'

The first use of 'jazz' in print recorded in the Oxford English Dictionary is from the San Francisco Bulletin of March 6, 1913. The quotation reads:

The team which speeded into town this morning comes pretty close to representing the pick of the army. Its members have trained on ragtime and 'jazz'.

Unfortunately the dictionary doesn't enable us to identify the game.

www.americandialect.org/books.html suggests (under 'Gerald Ciohen')that the word was originally used in print 'in a baseball context', so the game may be baseball. But www.enlou.com/time/year1913.htm suggests that the reference is to 'an army band'.