"I feel really good," said Horst, who has been on the disabled list since June 16 with a sprained left elbow. "It's the first time I've been pain free in a long time."
Horst was 0-2 with a 6.23 ERA in 28 appearances before he landed on the 15-day disabled list.
"It's been a crazy year," he said. "I feel like being young and being the first time through the league, and all of a sudden, these guys know who I am. They're coached to know. It is a challenge mentally to figure out how to go about getting these guys out on a consistent basis and inventing different ways and coming up with different stuff."
Todd Zolecki is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.