In a five-season career, Sembera posted a 3–11 record with a 4.70 ERA and six saves in 99 games pitched.\n', '

Sembera made his MLB debut with the Houston Astros in 1965 at the age of 23. In 1967, he recorded career-highs in games (45), innings pitched (59.2) and games finished (15). Sembera also pitched for the Montreal Expos in 1969 and 1970.\n', '

Following his career as a player, Sembera scouted for the Major League Scouting Bureau and with the Seattle Mariners for eleven years. \n', '

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