The deal finally is done. Cubs right-hander Carlos Zambrano has agreed to a five-year, $91.5 million contact extension. The deal, which includes a $19.25 million player option for a sixth year, gives Zambrano the highest average salary ever awarded to a pitcher on a multi-year contract. It also gives him the highest average salary in Cubs history, surpassing left fielder Alfonso Soriano, who signed an eight-year, $136 million, free-agent contract last off-season.