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Jabari Parker, as expected, is moving on to the NBA after one season at Duke.

Parker announced his decision Thursday in an article for Sports Illustrated.

"Ultimately, I boiled my decision down to two simple questions," Parker wrote:

"Which environment — college or the NBA — offers me the best opportunity to grow as a basketball player?

"Which environment — college or the NBA — offers me the best opportunity to grow and develop off the court?

"The answer to both questions is undeniably the NBA."

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Coach Mike Krzyzewski said in a statement it was "an honor for us to have him in our program."

Parker is widely expected to be a top-three pick in June's NBA draft after a spectacular freshman campaign at Duke. The 6-8 forward averaged 19.1 points and 8.7 rebounds en route to earning first team All-American honors. He also won the Wayman Tisdale Award, given to the nation's top freshman.

WATCH: BREAKING DOWN PARKER'S DECISION

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He took his time with this decision, opting to let the NCAA withdrawal deadline pass and waiting to gather more information before the hard-line NBA early-entry eligibility deadline of April 27.

"Coach K told me I needed to do what's best for me and that I will always be a part of the Duke family," Parker wrote. "We talked about the next steps. We discussed everything from agents, to workouts to USA Basketball. What I appreciated most was his support and friendship.

"Today I sent my letter of intent to the NBA. That makes it official — my days as a Duke basketball player are over.

"But my days as a Duke student are not. I intend to graduate from Duke while I'm in the NBA. I was an honor student when I arrived at Duke, and I'd like to graduate as one."

Parker entered the college game along with a crop of other talented freshmen — from Andrew Wiggins to Julius Randle and beyond — but quickly established himself as perhaps the most versatile and NBA-ready of the group. He drew comparisons to Grant Hill and Carmelo Anthony.

Over the past​ year, the Duke coaching staff worked with Parker to develop more facets of his game, including his positioning in the post, while teaching him how to take care of his body and game like he will have to in the pros. He started wearing contacts and putting orthotics in his shoes.

"Jabari has a chance to be one of the elite guys," Duke assistant coach Jeff Capel told USA TODAY Sports earlier this season. "I'm not talking about in college; I'm talking about as a pro and forever. He should be that."

Said Krzyzewski earlier this season: "When he has the ball, he's so excited and he can do things you don't teach. If he learns to play without the ball to the level I think he can, I think he'll be, in the NBA, a franchise player. I think he's going to be unbelievable."

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