Baseballically (1875)

“…. our boys have determined to go to Atchison just for fun, and clean out the town, baseballically speaking.” The St. Joseph Gazette, May 26, 1875, p1

Previous earliest use (Dickson Baseball Dictionary, 3rd edition, 2009):
1893. “We are game to the death, if we don’t get killed, baseballically, before we know it.” The Daily Picayune [New Orleans], May 14), 1893