Carpenter went 1-for-3 with a two-run homer and a walk in Sunday's 5-0 win over the Cubs.
Carpenter opened May with a flurry, smacking four home runs in the month's first five games. He hadn't gone deep since that point until Sunday, when his 435-foot shot to right center in the third extended the Cardinals' lead to 4-0. The blast pushed Carpenter's RBI total in May to 10, and he now leads the team in RBI (24) and slugging percentage (.523).