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The Cubs have turned their catching duties over to youngster Welington Castillo. But they will have a solid mentor for Castillo in veteran Dioner Navarro. “He's been helping me a lot,” Castillo told cubs.com. “He's a great guy. He told me, 'I'm here for you. Anything you want me to do, tell me. Anything you need to improve on, I'll help you, I'll let you know.'"