Perry's breakout season came in 1966 with a tremendous start, going 20–2 into August. Perry and Marichal became known as a "1–2 punch" to rival the famous Koufax/Drysdale combination of the Los Angeles Dodgers. While Marichal was NL Player of the Month in May, Perry was so named in June (5–0, 0.90 ERA, 31 SO). He played in his first All-Star game, but after August, he slumped the rest of the season, finishing 21–8, and the Giants finished second to the Dodgers. Marichal missed much of the 1967 season with a leg injury, and Perry was thrust into the role of team ace. While he finished the season with a disappointing 15–17 record, he had a low ERA and allowed only 7 hits per 9 innings pitched.