Daniel Thomas O'Brien (born July 26, 1962) is a former professional baseball pitcher. He played in Major League Baseball (MLB) for the Chicago White Sox (1985-1988) and the Milwaukee Brewers (1991). O'Brien primarily pitched as a relief pitcher, and occasionally as a starter. He was drafted by the Chicago White Sox in the 5th round of the 1984 MLB draft. After his playing career, O'Brien was involved in coaching at the collegiate level.
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