MILAN — The confidence and comfort level in Jared Sullinger is rapidly increasing, as evidenced by his insertion into the starting lineup Sunday night as the Celtics concluded their European trip against Emporio Armani Milano at the Mediolanum Forum.

It was Sullinger’s second professional game, and there he was, being introduced alongside Pierce, Rondo, Garnett, and Terry. And Sullinger handled the responsibility well, scoring 9 points and adding seven rebounds in the Celtics’ 105-75 win over the Italian League team.