Mike Krzyzewski

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Duke head coach Mike Krzyzewski reacts to a call at the end of the first half of a quarterfinal NCAA college basketball game against Clemson at the Atlantic Coast Conference tournament in Greensboro, N.C., Friday, March 14, 2014. (AP Photo/Bob Leverone)

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Duke head coach Mike Krzyzewski reacts to a call at the end of the first half of a quarterfinal NCAA college basketball game against Clemson at the Atlantic Coast Conference tournament in Greensboro, N.C., Friday, March 14, 2014. (AP Photo/Bob Leverone)

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In this photo taken Wednesday, March 5, 2014, Duke head coach Mike Krzyzewski argues a call during the first half of an NCAA college basketball game against Wake Forest in Winston-Salem, N.C. Coach Krzyzewski is out of the hospital after feeling light-headed after a loss at Wake Forest. The school said in a statement Thursday, March 6, that Krzyzewski was taken to Duke University Hospital in Durham for a precautionary examination after the 82-72 loss in Winston-Salem.(AP Photo/Chuck Burton)

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In this photo taken Wednesday, March 5, 2014, Duke head coach Mike Krzyzewski bows his head as he sits on the bench during the second half of an NCAA college basketball game against Wake Forest in Winston-Salem, N.C. Coach Krzyzewski is out of the hospital after feeling light-headed after a loss at Wake Forest. The school said in a statement Thursday, March 6, that Krzyzewski was taken to Duke University Hospital in Durham for a precautionary examination after the 82-72 loss in Winston-Salem.(AP Photo/Chuck Burton)