Harry Vernon Mercer (March 10, 1889 – June 25, 1945) professionally Jack Mercer, was a Major League Baseball pitcher who played for the 1910 Pittsburgh Pirates in one game on August 2, 1910. Prior to his brief appearance with the Pirates, he played from 1907 to 1910 in the minor leagues.

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1889 births 1945 deaths Pittsburgh Pirates players Baseball players from Ohio Major League Baseball pitchers Springfield Babes (baseball) players Springfield Reapers players Marion Diggers players Peoria Distillers players Sportspeople from Zanesville, Ohio Portsmouth Cobblers players {{US-baseball-pitcher-1880s-stub