Williamson was the AP Player of the Year, Naismith Award victor and Wooden Award victor among his many accolades this season.
With Williamson officially declaring, Duke will have to prove it can repeat this season's success with a vastly different cast of characters next season.
Duke earned a No. 1 overall seed in the 2019 NCAA Tournament, thanks to the play of Williamson, R.J. Barrett, Cam Reddish and others, though had a disappointing finish to the year.
For months, it had been considered just as many of his terrific highlights - a slam dunk without question - and on Monday evening, Zion Williamson finally made the obvious official.
Williamson averaged 22.6 points and 8.9 rebounds per game this year while guiding the Blue Devils to an appearance in the Elite Eight.
While Williamson is expected to be taken with the No. 1 overall pick, he doesn't know where he'll be playing next season. The Phoenix Suns share the same best-possible odds at the No. 1 pick of 14 percent with the New York Knicks and Cleveland Cavaliers.
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