アリゾナリーグ
In 2009, Decker batted .354 (3rd in the league) and led the Arizona League in home runs (15), RBIs (63-an Arizona League record), doubles (21), extra-base hits (39), total bases (142-an Arizona League record), slugging percentage (.717), and OPS (1.138), was 2nd in hits (70), 4th in runs (46) and on base percentage (.421), and had the best fielding percentage for a first baseman, while playing for the Arizona League Padres. Decker was named the AZL Most Valuable Player (beating out Mike Trout), a Topps Short-Season/Rookie All Star, and Topps Post-Season All Star.