“….the St. Louis score being thereby tied, amidst loud applause, as an extra innings game was now looked forward to by the spectators, who like nothing better in a match than this.” Brooklyn Daily Eagle, September 13, 1877. p1
Previous earliest use (Dickson Baseball Dictionary, 3rd edition, 2009):
1ST USE. 1885 (Spalding’s Official Base Ball Guide, p. 19; Edward J. Nichols).