Brevard County Manatees
He was promoted to helm the Class A-Advanced Brevard County Manatees. In 2008, the team finished with a 66–72 (.478) record. Guerrero returned to postseason action in 2009 (79–48 (.622)). However, the Manatees fell to the Tampa Yankees, losing the North Division title. Guerrero was honored by being named to the 2009 Florida State League postseason All-Star Team as a coach.