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By Stan Grossfeld Globe Staff PHOENIX - Peering out at pigtails, Oakland A's outfielder Coco Crisp playfully made a face at Justine Siegal, who is believed to be the first woman to pitch batting practice to a major league team. ``Better not hit me,'' he joked. ``I'll charge the mound.'' Had he done so, Siegal probably would have killed him with kindness. ``That's how I react to adversity,'' said the 36-year-old righthander from Springfield, Mass. ``I've been fighting my whole life.'' So