The Cardinals have won five of six against the Reds already this season after going 14-5 against Cincinnati in 2004.
Carpenter allowed three hits through eight innings before Felipe Lopez led off the ninth with his 12th homer, ending the right-hander’s career-best scoreless streak at 17 innings.
Marquis has also pitched well for St. Louis this season, going 8-4 with a 3.59 ERA. The 26-year-old right-hander has beaten the Reds in two starts against them, posting a 1.26 ERA over that span. Marquis is 3-1 with a 3.26 ERA in six starts against the Reds for his career.
St. Louis has a 9 1/2 game lead in the NL central despite having several players dinged up.
Larry Walker was scratched from the Cardinals’ lineup Monday just before game time with a stiff neck.
Center fielder Jim Edmonds has missed the first six games of St. Louis’ road trip with a rib injury.
The Cardinals were ready to send Edmonds home for treatment of a hairline fracture of his left middle rib, but he said he was feeling better. Edmonds, who’s batting .285 with 11 home runs and 39 RBIs, could be available to pinch-hit on Tuesday.
Reds leadoff batter Ryan Freel, who has started at five positions this season, missed his second straight game with a sore toe. Freel is batting .287 and leads Cincinnati with 21 stolen bases.
The Reds, will send lefty Brandon Claussen to the mound on Tuesday. The 26-year-old Claussen is 2-1 with a 3.25 ERA over his last six starts.
Cincinnati has lost seven of its last eight overall.