Molina returned to the field against Boston at Fenway Park as the designated hitter. In that game, his solo home run provided the difference in a 5–4 Cardinals victory. It was also the first game of the first of two 13-game hitting streaks for the season. His first career start at first base, also against Boston, occurred two days later. During that streak, he collected 17 hits in 47 at-bats for a .362 batting average. The second hitting streak spanned from August 16 to September 2, where he successfully hit 19 times in 50 at bats for a .380 average. On September 2, he and Felipe López hit consecutive home runs against the Arizona Diamondbacks en route to an 8–2 victory.