Stewart went 1-for-5 with a three-run home run in Sunday's 9-6 win over the Rockies.
Stewart extended Cincinnati's early lead to 8-1 with a three-run shot in the second inning. He didn't know it then, but the three-run knock was necessary for the Reds to hold onto the victory. It was the 20th homer of the season for the rookie, who leads the club in that category as well as RBI (70).