Joe Horlen debuted in the Majors with the Chicago White Sox in 1961, and two years later, he was one of the top Starters of the team. Horlen would come of age in 1964, with a 1.88 ERA (second in the AL), and he led the league in WHIP (0.935) and H/9 (6.1). Horlen kept his ERA under 2.90 in the next two seasons, and in 1967 he would win 19 Games, go to the All-Star Game, and win the ERA Title (2.06), and his second WHIP Title (0.953). He also was fourth in MVP voting and second in Cy Young voting.
Horlen had two more 10 Win seasons, but he lost 16 Games in 1970, and his ERA ballooned to nearly five.
He was released just before the 1972 season, and he would sign with the Oakland A’s, where he would play one more year, helping them win the World Series, albeit in a minor role. With Chicago, he had an even 113-113 record with 1,007 Strikeouts.