"Hitting isn't easy," said Rosario, who has seven home runs, 19 RBIs and a .287 average. "You just have to keep your mind fresh. I can't afford to think a lot about it, because I have to concentrate on my defense.
"When I've got a bat, I think about my offense. When I've got a mitt, I think about my defense. You've got more time to think about your defense because you're behind the plate for nine innings, and you may bat four times in a game."
Rosario has improved defensively after a rough rookie year in 2012, but still has room to develop. His ability to bounce back after tough games and have an impact offensively is a trait that impresses manager Walt Weiss. He believes Rosario will develop into a star.
Weiss also thinks that Rosario is handling the slump well.
"He's going to be a guy that hits for power, hits for average and be an offensive force in this league for a long time," Weiss said. "He brings a lot of positive energy every day. He's got a great attitude, a great mentality for this game.
"He smiles a lot, and that's good. He's very comfortable in his own skin, a very confident player. His teammates like him. He brings a lot."
Because Torrealba started Saturday, Weiss said he planned to start Rosario on Sunday with left-hander Jorge De La Rosa pitching. Torrealba has caught all seven previous starts of De La Rosa (3-3, 3.52 ERA), and the two have meshed well.
Thomas Harding is a reporter for MLB.com. Read his blog, Hardball in the Rockies, and follow him on Twitter @harding_at_mlb. This story was not subject to the approval of Major League Baseball or its clubs.