When Starlin Castro cost the Cubs a lead against the Giants by forgetting how many outs there were, he knew the wrath he faced after the game. Manager Dale Sveum put his erratic shortstop on notice by calling it "the last straw,'' but that wasn't the lecture Castro dreaded most. Disappointing his manager was one thing. Letting down his mentor, Alfonso Soriano, was another. "Soriano talks to me like a man and said I can't do that again,'' Castro said Tuesday before the Cubs' second straight win over the White Sox. "He's like a father. He's helped me more than my father in this game. Like every day he says, 'Let's go to the cage.' He treats me like his son, on and off the field.''