Keller (7-11) allowed five earned runs on seven hits and five walks while striking out five across five innings, taking the loss to the Cardinals on Saturday.
Keller continued his struggles walking batters, with his BB/9 rising to 4.4. He surrendered a home run to Nolan Arenado in the fifth inning. The 25-year-old has a career-worst 5.79 ERA and a 1.71 WHIP in 116.2 innings. In addition, he has a mediocre 1.8 K/BB. He will get another chance to start against the Cardinals next weekend.