Wasn't his major league debut one of the best starts of his career? I would guess he felt more pressure than any other time in his career. I really doubt he's out there shaking just because the Cubs are the opponent. He's pitched well in plenty of big starts. I think you're making too much out of him not having command early in an outing, it happens. He had like a 2 ERA coming into today, he is a little bit better than a 3. Peralta is fine.