"It's the first time he's been the guy," Sveum said Monday. "He's our No. 1 catcher, and his season has gradually gotten better and better and better. We're seeing the emergence of what he can do with the bat lately. I think there's still a lot more in that tank with that swing as soon as he gets more comfortable, it'll show next spring when he knows he's the guy and he's done it all and he can take a little more initiative."
Castillo was batting .294 in his last 10 games, hitting three of his seven home runs in that stretch.
Carrie Muskat is a reporter for MLB.com. She writes a blog, Muskat Ramblings, and you can follow her on Twitter @CarrieMuskat. This story was not subject to the approval of Major League Baseball or its clubs.