Solis was added to the 25-man roster Wednesday because the bullpen was taxed during the last week.
Solis was in a whirlwind on Thursday and didn't remember much until he hit the mound.
"After the first pitch, you get the jitters out and you dream of that moment your whole life," Solis said. "Once that's done, it's baseball and pitching. I know how to do that."
Selected in the second round of the 2010 First-Year Player Draft, Solis was looked at as a starter. But a few years later -- after Tommy John surgery and lingering back problems -- Solis found himself in the bullpen.
"It's different, I'll tell you that. It's a different mindset," Solis said. "Instead of worrying about six or seven innings, you are worrying about one or two. So making that adjustment has been different. I wouldn't say it has been hard, it's just been different. I'm asking questions all the time; I'm trying to learn as much as I can. I'm getting the hang of it. It's going to progress, I think. But for now, I think it's going well."