The 6-foot-2, 200-pound Harrison, of Lee's Summit (Missouri) West High School, was largely considered the top athlete in the draft, though he slid from the No. 17 spot on ESPN MLB Insider Keith Law's Big Board.
Harrison signed a letter of intent with the Cornhuskers in February to play football for coach Bo Pelini and baseball for coach Darin Erstad.
Erstad, a former No. 1 overall pick in the baseball draft and longtime big-leaguer who played football and baseball at Nebraska, factored heavily in Harrison's college decision. The deadline for draft picks to sign with major-league clubs is July 15.
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