Stewart went 2-for-4 with a two-run home run in Saturday's 17-5 loss to the Cubs.
Back in the third inning, before Chicago took a double-digit lead, Stewart cut the Reds' deficit to 6-4 when he clubbed his 30th homer of the season. He became the second Reds rookie to reach that threshold after Hall of Famer Frank Robinson, who slugged 38 in 1956. Stewart leads the majors with 104 RBI and is one of the favorites to be named NL Rookie of the Year.