Kelly left his job as UCLA's head coach to join Day's staff at Ohio State this offseason, reuniting teacher and pupil.
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On Saturday, in a Big Ten showdown, their second-ranked Buckeyes travel to No. 3 Oregon, where more than a decade ago, as Day put it, Kelly made his name "revolutionizing" offense.
Now on the same side again, they're hoping to capture their elusive first national championship.
"We've been around each other for so long that we share a lot of the same views of how the game is supposed to look," Kelly said. "That makes it so much easier. ... It's been great."
Though he's now the boss, Day is 15 years younger than Kelly. Still, the two have a unique bond forged by a shared history and shared experience growing up in Manchester, where they played sports for the same youth coaches, attended the same high school, played quarterback for the same college and later coached on the same staff there.