By MICHAEL MAROT
AP Sports Writer
INDIANAPOLIS (AP) — Michigan coach Jim Harbaugh has a new defensive coordinator for the second straight year. Ohio State coach Ryan Day also made a coaching change. Iowa coach Kirk Ferentz and seemingly everyone else in the Big Ten need to plug defensive holes, too. Relying on revamped defenses has become a trend in the traditionally rough-and-tumble Big Ten. It often becomes the definitive line between success or failure.
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