Masi's batting continued to improve in 1945 when, he was hitting at a .335 pace in July to earn a place as a reserve catcher for the National League team in the 1945 All-Star Game however, the game was cancelled due to wartime travel restrictions. Masi finished the season with a .272 batting average along with 25 doubles, 7 home runs and 46 runs batted in. He also led National League catchers in assists and was second in putouts and in baserunners caught stealing.