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Wilfred Charles Siebert (born January 14 1937 in St. Mary, Missouri) is a former Major League Baseball pitcher from 1964 to 1975. He finished with a record of 140-114 and a 3.21 ERA. He threw a no-hitter on June 10, 1966 against the Washington Senators. He was originally drafted simultaneously by the Cleveland Indians and the St. Louis Hawks of the NBA.