The Celtics’ toughest opponent is now boredom
How does it feel to run a marathon after training on cake walks?
Ask the Celtics in a couple months. The Celtics have clinched the NBA’s first playoff berth with four weeks still left in the regular season. Thanks to Thursday’s win over Phoenix and an ensuing Sixers loss, they are now 9.5 games up on the second-seeded Bucks in the Eastern Conference standings. That gulf is wide enough they’ve…