Grady Hatton began his major-league playing career as the Reds' regular 3rd baseman from 1946-52. He kicked around with the White Sox, Red Sox, Cardinals, and Orioles from 1954-56, then became a minor-league player-coach until 1961 (which included a short stint in 1960 playing for the Cubs).
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In 1962, Grady was hired as the director of player personnel for the expansion Houston Colt 45s. He followed that with 3 seasons as the manager of Houston's AAA Oklahoma City team before getting the call to the big club in 1966.
Hatton's major-league managerial career was brief. After 2 full seasons in 1966 (8th place) and 1967 (9th place), Grady was fired after 61 games in 1968, with his team in 10th place. I guess having the lowly Mets pass them in the standings was just not acceptable! He was replaced by Harry Walker, who had been fired in mid-1967 by the Pirates.
Hatton continued with the Astros as a scout until 1972. He also scouted for the Giants in the 1980s.