Two NBA sources told the Globe that the Celtics will open their 2013-14 season against the Toronto Raptors. The official NBA schedule is set to be released tonight at 6 p.m.

The opener against the Raptors will signal the beginning of the Brad Stevens era but also a sign that the Celtics -- without Paul Pierce Doc Rivers and Kevin Garnett -- are no longer a major television draw. They have usually opened the season with a high-profile nationally televised game against teams such as the Miami Heat the past several years.