Charles H. "Duke" Esper (July 28, 1867 – August 31, 1910)[1] was an American professional baseball player who played pitcher in the Major Leagues from 1890 to 1898.

Esper played for the Philadelphia Athletics, Pittsburgh Pirates, Philadelphia Phillies, Baltimore Orioles, Washington Senators, and St. Louis Browns.

Esper pitched 1727.2 innings, winning 101 games and losing 100.

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