John Thomas O'Brien (born December 11, 1930 in South Amboy, New Jersey) is a former backup second baseman and pitcher in Major League Baseball who played for the Pittsburgh Pirates (1953, 1955–58), St. Louis Cardinals (1958) and Milwaukee Braves (1959). O'Brien batted and threw right-handed. His twin brother, Eddie, is a former major league shortstop.O'Brien attended Saint Mary's High School in South Amboy, now Cardinal McCarrick High School, where he has been inducted into the school's sports hall of fame. Wikipedia
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