Becker may be best known for being a key reserve on the 1945 Chicago Cubs, the last Cubs team to win a National League pennant until 2016. He got into 67 games and hit .286 with two home runs, 27 runs batted in, and 25 runs scored. He played solid defense, making no errors in 28 appearances at first base. In the 1945 World Series he made three appearances as a pinch hitter, going 1-for-2 with a walk. His hit was a single against winning pitcher Dizzy Trout in Game 4.