Heuer (7-4) allowed two earned runs on one hit and three walks while striking out one across one inning, taking the loss to the Cardinals on Sunday.
Heuer entered the ninth inning in a tie game, and quickly gave the lead to St. Louis. Although two of the walks were intentional, it wasn't a good showing for the pitcher, who also had a wild pitch that allowed a run to score. The 24-year-old has a 3.25 ERA and 1.19 WHIP with 17 punchouts in 27.2 innings with the Cubs this season.