Competition is the name of the game in sports. But without a doubt, the fiercest battles are fought when longtime rivals come face to face. Here are in-depth looks at five such legendary rivalries: The Yankees versus the Red Sox, the Celtics versus the Lakers, the United versus the Galaxy, the Canadiens versus the Bruins, and the Bears versus the Packers. Each section is packed with intense play-by-play game action, recaps of classic moments that sparked the feuds and insights into heated clashes. And because it's Matt Christopher, young readers know they're getting the best sports writing on the shelf!