The former University of Washington guard made it official on Twitter:
According to Adrian Wojnarowski of The Vertical, Fultz and Nike came to terms on a multiyear contract.
Fultz is widely considered the best overall prospect in the draft, and he is the top candidate to go No. 1 overall to the Boston Celtics.
In one season with the Huskies, Fultz averaged 23.2 points, 5.9 assists, 5.7 rebounds, 1.6 steals and 1.2 blocks per game.
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ESPN's Chad Ford reported Thursday that while Fultz is among the players Boston is considering at No. 1, it also likes Kansas swingman Josh Jackson.
In his latest mock draft, however, Ford projected that Boston will indeed add Fultz to a backcourt that already includes Isaiah Thomas, Avery Bradley and Marcus Smart.