Two-Base Hit (1870)

The Mutuals now went into their ninth inning, and as Nelson led off with a good two-base hit, matters looked promising for the Mutuals.New York Daily Tribune, August 17, 1870, p8

Previous earliest use (Dickson Baseball Dictionary, 3rd edition, 2009):
1ST USE. 1872 (The Boston Daily Globe, Apr. 15; Peter Morris).