He made his MLB debut for the franchise on September 18, 1960, nine days before his 25th birthday, pitching two innings, giving up an earned run, and striking out one in a 9–2 loss against the Cleveland Indians. In 1962, he posted an 11–4 win–loss record and led American League pitchers with a .733 winning percentage, and went 12–15 with a 3.78 earned run average (ERA) the following year.
He made his MLB debut for the franchise on September 18, 1960, nine days before turning 25, pitching two innings, allowing one earned run, and striking out one in a 9–2 loss against the Cleveland Indians. In 1962, he had an 11-4 record with a .733 winning percentage, leading American League pitchers. The following year, he went 12-15 with a 3.78 ERA.