Everyday Player (1885)

“Sunday is about as good an every day player as Chicago can boast.” The Daily Picayune,  July 21, 1885, p8

Previous earliest use (Dickson Baseball Dictionary, 3rd edition, 2009):
1ST USE. 1892. “Seven of [Mobile’s] every-day players are left-handed batters” (Atlanta Constitution, May 3; Peter Morris). 

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