Angels, Sox and the speed divide

Howie Kendrick has been among the best baserunners in baseball this season. David Cooper/Toronto Star/Getty Images

One win can make all the difference in a hotly contested pennant race, and at least two of the divisions in the American League -- the East and West -- already are shaping up to go down to the wire.

In close races, even the smallest things can make a difference, and baserunning is a minor -- yet crucial -- factor. The importance of intelligence on the basepaths is demonstrated by the Los Angeles Angels and Boston Red Sox, the teams that rank 12th and 13th, respectively, in this week's ESPN Power Rankings.