North Carolina-Duke rivalry as hot as ever, but for how much longer?
Math, common sense and biology dictate that Mike Krzyzewski doesn't have a whole bunch more of these Duke-North Carolina games left. Nobody's suggesting he's ready to retire, but neither is anyone saying he'll still be coaching into his 80s. And on the other side sits Roy Williams
, age 62. But it served as another reminder that the two principal figures in this riveting rivalry are much closer to the end of their runs than to the beginning. (Yahoo! Sports
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