The NBA’s Boston Celtics and Beasley Media Group sports talk WBZ-FM, Boston “98.5 The Sports Hub” announces a multiyear extension of their broadcast agreement. The station has been the official flagship Station of the Boston Celtics Radio Network since 2013. Under the terms of the pact, Sean Grande and Cedric Maxwell will continue to be the voices of the team radio broadcast. In addition to the games, “98.5 The Sports Hub” will also air Celtics related programming throughout the season, including a weekly call-in from Celtics head coach Joe Mazzulla on “The Zolak & Bertrand Show” each Wednesday during the season.