Rivalries are mostly dependent on where you live or what sports
teams you follow. Most people sense the most heated rivalries are
located near them, because they are most involved with the people
who are interested in the rivalries. Common rivalries include
interstate rivalries, and neighboring college rivalries. On a
national basis, the most known sports rivalries are the New York
Yankees v. Boston Red Sox and Joe Frazier v. Mohammed Ali,
etc..
For more see Related Links below.