More than a year after his first game in a Celtics uniform, Ron Harper Jr. finally landed an official contract with Boston this week.

Harper had his training camp tryout deal converted to a two-way contract on Thursday, enabling him to play in games for both the Celtics and their G League affiliate this season.

The promotion was a long time coming for the 6-foot-6 Rutgers product, who played for the Celtics’ Summer League squad last offseason, attended C’s training camp last fall and appeared in 14 games for the Maine Celtics early last season.

“I just came in and worked hard,” Harper, 25, said after Friday’s practice. “I was kind of unaware of the opportunity that was going to present itself, but it ended up happening over time. But (it was) just a testament to the hard work and dedica

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