The Boston Celtics continue to grow under coach Brad Stevens, both figuratively and literally, making them the best bet to challenge the Toronto Raptors when their season tips off Wednesday night.

The Celtics will host the Philadelphia 76ers in their opener at 7:30 p.m. at the TD Garden.

By adding forwards David Lee and Amir Johnson, the Celtics have the size to go with their skilled backcourt in Avery Bradley, Marcus Smart and Isaiah Thomas. Another season of improvement should position the Celtics to make more impactful moves in next summer’s free agent bonanza.

Boston’s projected starters are Smart and Bradley along with forwards Jae Crowder and Lee and center Tyler Zeller. Their top reserves will be Thomas, Johnson, swingman Evan Turner and forwards Kelly Olynyk and Jonas Jerebko.

The Celtics finished last season 40-42 in the regular season and are way ahead of the Lakers in their rebuilding efforts. They made it to the first round of the playoffs last season in Stevens’ second season and feature good defense and depth but still have a long way to go to recapture the recent glory that left town alongside Doc Rivers.

Having good depth may not be enough for much of a playoff run until Boston finds a couple of stars.