 In Milwaukee, Pattin finished with a 14–12 record and a 3.39 ERA in 1970, and was named an All-Star in 1971, when he finished with a 14–14 record and a 3.13 ERA.Pattin was part of a ten-player blockbuster that sent him, Tommy Harper, Lew Krausse and minor-league outfielder Pat Skrable to the Red Sox for George Scott, Jim Lonborg, Ken Brett, Billy Conigliaro, Joe Lahoud and Don Pavletich on October 10, 1971.He won 32 games in two seasons with the Red Sox, including a no-hit bid foiled in 1972, when A's Reggie Jackson hit a single off him with one out in the ninth inning.