o on Sunday, on 16 April 1967, professional soccer took its first bold steps in the US as the National Professional Soccer League made its debut. 7) Boston CelticsStrengths The Celtics have one of the best coaches in the league in Brad Stevens, t. “We’re aware there’s an ongoing dialogue between players of whether to form a union or organized group,” Duffy said. The Cavaliers’ second-half struggles have been real enough to give some hope for teams in the Eastern Conference.