Competition is the life blood of sports. The NFL is unequivocally the most popular professional sport in America, and while the league and it's 32 franchises have evolved into a billion dollar juggernaut, it would never succeeded without the fierce rivalries and passion fueled by the competitive spirit of those who play the game.
This holds true in the NBA, MLB, NHL and all collegiate, professional and amateur sports. This same spirit not only inspires the heart-stopping drama and historic, game-defining plays that live long in the minds of fans everywhere, it naturally sparks individual feuds.
Hockey sticks jabbed into ribs away from the action, shoving long after the whistle has blown—bad blood is part of the game, part of the fierce desire to win. And, it's not something exclusive to rivals on the field; there are plenty of examples of teammates, coaches and others with a stake in the game.
Adversaries have given us some of the greatest, most iconic moments in sports, as well as some of the most entertaining.
Let's take a look at 30 of the best rivalries ever in sports.