Frank Day Truesdale was an American second baseman in Major League Baseball who played from 1910 through 1918 for the St. Louis Browns (1910–1911), New York Yankees (1914) and Boston Red Sox (1918). Listed at 5 feet 8 inches (1.73 m), 145 lb., Truesdale was a switch-hitter and threw right-handed. He was born in St. Louis, Missouri.