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Kevin CummingsAlthough his career was rather short (just 3 years) and he was a pitcher, Bill James has labeled Frank Gilmore the worst professional baseball player in the 19th century. No one would have been listening to his pitching tips and his batting average made Mario (The Mendoza Line) Mendoza look like Babe Ruth by comparison!
http://www.baseball-reference.com/g/gilmofr01.shtml
http://www.baseball-reference.com/m/mendoma01.shtml