"The last three years at Gonzaga have been a dream come true, and now I'd like to pursue my next dream of playing in the NBA," Hachimura wrote.
Hachimura intends to hire an agent.
Ranked No. 18 in the ESPN top 100 of NBA draft prospects, Hachimura averaged 19.7 points and 6.5 rebounds per game for the Bulldogs, who reached the Elite Eight as a No. 1 seed before losing to Texas Tech.