A bonus baby signed by the Cincinnati Reds out of Northwestern University, Hook made his major league debut with Cincinnati in 1957. He joined the Reds regular pitching rotation in 1960 and had an 11–18 mark, including a two-hit shutout against the Milwaukee Braves.[2]
On April 23, 1962, Hook became the first winning pitcher in Mets franchise history, tossing a complete-game, five-hitter in New York's 9–1 win over Pittsburgh at Forbes Field, giving the team its first regular-season victory after nine defeats. In that season he compiled an 8–19 mark for the Mets, and led the team in complete games with 13 and games started with 34.[1]
Those 1962 Mets had a record of 40–120, still the most losses for any major league team in a single season since the 19th century.
The Mets traded Hook, cash, and a minor leaguer named later to the Milwaukee Braves for Roy McMillan on May 8, 1964. The Braves then sent Hook to their minor league team in Denver[3] where he pitched a nine inning no-hitter that he lost in the 10th inning.[4] Towards the end of the 1964 season he was called up to the parent team[5] but did not appear in any games for them.