NBA All-Star 2023: Celtics' Joe Mazzulla to lead Team Giannis, makes history as first-year head coach | CBS Sports Headlines NBA All-Star 2023: Celtics' Joe Mazzulla to lead Team Giannis, makes history as first-year head coach Mazzulla is just the third first-year head coach to be in charge of an … Continue reading NBA All-Star 2023: Celtics' Joe Mazzulla to lead Team Giannis, makes history as first-year head coach