The expectations have risen steadily for Jeff Green since his return from surgery to repair an aortic aneurysm, and this season they will soar as he emerges as one of the leaders of the Celtics in another transition season.

Green is the team’s leading returning scorer and entering the third year of a four-year contract that concludes with a player option for next season. A breakout year from the small forward could mean a lucrative free agent contract next summer.

The Celtics have been waiting for such production, although Green slowly became a more productive scorer in his second season following surgery. He missed all of 2011-12.

Now at age 28, entering the prime of his career, Green said he understands and embraces his increased responsibility in the Celtics’ success.

“I’ve been working on everything basically,” he said last week. “There’s not one thing I didn’t work on. Just coming into camp in good shape, new focus, and a lot of people say it’s a different vibe they feel from me now and I just have to transfer it on the court, continue to get better as a player, and find a way to stay consistent. I think that’s been my biggest fall throughout my career, so I’ve just got to find a way to do that.”

Green averaged 16.9 points per game last season but a career low 41.2 percent from the field. The issue was 3-point shooting. He took a stunning 214 more 3-pointers last season than in 2012-13 but only converted 65 more.

Celtics coach Brad Stevens would love to see Green become more active in the paint, drawing fouls and using his length and size to score.

“I think it’s a new confidence that I have as far as my game and I think that just comes with a different …read more