Masi was then purchased by the Milwaukee Brewers who assigned him to play for the Springfield Indians of the Middle Atlantic League. Baseball Commissioner Kenesaw Mountain Landis found this move to be in violation of baseball rules and allowed him to sign a non-reserve contract with Springfield, meaning that he would be a free agent at the end of the season. He played mostly as a catcher for Springfield in where his backup that year was the future All-Star catcher for the Cleveland Indians, seventeen-year-old Jim Hegan. Masi posted a .308 batting average with 16 home runs and 97 runs batted in for Springfield, earning a promotion to the major leagues when he was signed by the Boston Braves, then known as the Bees.