"He's definitely made probably the biggest progress of anybody on the team right now," Cubs manager Dale Sveum said of Castillo, who has started 34 games behind the plate. "The changes he's made in his defense and calling the game and the preparation [are impressive]. His whole attitude has changed into an everyday catcher's mindset.
"I think he's starting to have a lot more fun and understanding the progression. He's had to go through," Sveum said. "I think going into Spring Training, he'll feel like he's the everyday catcher, no matter what we do. He'll have that mentality that he'll catch 120 games next year."
Castillo, who has shared the job with Steve Clevenger this season, was batting .281 entering Monday's game, and has thrown out five of 32 basestealers.