"I didn't think it got me pretty good at first, but I guess it did," Castro said.
Davis' bat hit Castro while he was trying to throw out the Tigers' Andrew Romine at second base on an attempted steal. Castro thought nothing of it at the time and stayed in the game, but the arm began to hurt later.
Keeping Castro out of the lineup was made easier considering the Astros were facing a left-handed starting pitcher. Astros manager Bo Porter said Castro would be in the lineup Saturday and Sunday against the Orioles while facing right-handers Miguel Gonzalez and Chris Tillman.
Brian McTaggart is a reporter for MLB.com and writes an MLBlog, Tag's Lines. Follow @brianmctaggart on Twitter. Teddy Cahill is a reporter for MLB.com. Follow him on Twitter at @tedcahill. This story was not subject to the approval of Major League Baseball or its clubs.