"I've been battling it for a couple days," Haren said. "Usually, right about now, if not a little bit before, you get it. It lasts about a week or so. I'm sure it'll be fine."
Haren, who came in having given up just three runs in 15 Cactus League innings, gave up two runs on nine hits in 5 2/3 innings to bring his spring ERA to 2.18 in the Angels' 5-4 loss. His next start -- his last before the regular season -- will come under the lights against the Dodgers at Angel Stadium on Monday, which Haren admits does provide a little needed adrenaline.
Angels manager Mike Scioscia believes most pitchers go through that "dead arm" phase.
"It's just part of Spring Training," Scioscia added.
"The arm feels slow. That's all it really is," Haren said. "And I think the normal thing to do is to try to add a little bit, then your mechanics can get a little out of sort. So I wasn't trying to add too much. I knew my arm wasn't feeling that great. Health-wise, my body feels great, my arm is healthy, and I'm where I need to be.
"Next time out, I'm sure it'll feel a lot better. Then it's game time."