The team's offseason moves, including adding big men Luke Kornet and Kelly Olynyk, have bolstered the rookie's optimism.

LAS VEGAS — The Celtics opened Las Vegas Summer League play with a 92-78 win over the Grizzlies on Friday. First-round pick Hugo Gonzalez tallied 12 points, 5 assists, 4 rebounds and 2 blocks, and third-year forward Jordan Walsh had 17 points. Center Charles Bassey, a late addition to the roster, added 14 points and 11 rebounds.