"It seems like every year to start, I'm a little slow, and I think it has to do with some timing stuff," he said. "Usually, guys with leg kicks and things like that, they take more time to get comfortable with timing and fine-tuning that aspect of it. I feel really good.
"For the past week and a half or so, I've felt pretty locked it. It probably started in Seattle [last week], so I'm really happy with where I'm at and continue to move forward and kind of fine-tune things when they get off a little bit. I feel like I've reached a point where I'm comfortable in the box and I have a good feel for where I want to be."
Castro began the season with just two hits in his first 20 at-bats. He struck out all three times he stepped to plate in Wednesday's 7-0 loss to end his hitting streak.
Brian McTaggart is a reporter for MLB.com and writes an MLBlog, Tag's Lines. Follow @brianmctaggart on Twitter. This story was not subject to the approval of Major League Baseball or its clubs.