I april 2019, efter kun ét år i college, som er det minimum man skal spille for at kunne blive udtaget til [[NBA]], meddelte Williamson at han ville melde sig klar til [[2019]]-udgaven af NBA's [[draft]].<ref>{{cite news|url=https://www.espn.com/mens-college-basketball/story/_/id/26532333/zion-declares-draft-best-year-life|title=ESPN: Zion declares for draft after 'best year' of life|date=2019-04-15}} {{en sprog}}</ref> Flere medier beskrev ham på dette tidspunkt som det største talent til at komme ind i NBA siden [[LeBron James]], der blev udtaget i [[2003]].<ref>{{cite news|url=https://www.theringer.com/nba-draft/2019/6/18/18681851/the-zion-williamson-machine-new-orleans-pelicans-duke-spartanburg|title=The Ringer: How Zion Became Bigger Than the Basketball Machine That Built Him|date=2019-06-18}} {{en sprog}}</ref><ref>{{cite news|url=https://eu.usatoday.com/story/sports/nba/draft/2019/06/19/zion-williamson-top-overall-pick-nba-draft-new-orleans-pelicans/1503858001/|title=USA Today: Zion Williamson on NBA future, comparisons to LeBron: 'I'm just trying to be first Zion'|date=2019-06-19}} {{en sprog}}</ref>
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