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Boston Celtics 2013 NBA basketball draft pick Kelly Olynyk faces reporters during a news conference in Boston, Monday, July 1, 2013.

(AP Photo/Steven Senne)

ORLANDO, Fla. – After making a great first impression during his NBA summer league debut, Sunday only got better for Boston Celtics first-round draft pick Kelly Olynyk.

The 7-footer from Gonzaga has officially signed with the Celtics, the team announced Sunday night. Terms of the deal were not released, but teams are allowed to pay their first-rounders 120% of the rookie pay scale ($1.66 million for the 13th pick). Because most teams pay the full 120%, it’s likely that Olynyk will make about $1.99 million during his rookie season.

Olynyk dazzled Sunday in Orlando for the Celtics summer league entry, scoring a game-high 25 points on 9-12 shooting. Boston still lost 95-88 to the Magic, but the rookie big man impressed new head coach Brad Stevens.

“I really like his game," said Stevens. "He’s really bright, you can tell he makes others around him better. I thought he did some good things defensively as well. He’s going to be a good player.”