Nationally, when baseball rivalries are discussed, it's usually the one that involves two teams called the New York Yankees and Boston Red Sox that get the attention. Actually, it's always that particular rivalry, but there is also another one in the old Midwest that is pretty good too. This year, it's even more interesting, as the Chicago Cubs sit pretty comfortably on top of the Central Division with the St. Louis Cardinals right in the Wild Card race. The two teams have neve...