The second round is officially set, and the Eastern Conference playoff picture looks completely different after the conference’s top favorite was sent packing in stunning fashion. The Boston Celtics' Epic First-Round Collapse The Boston Celtics entered their first-round series with all the usual championship expectations and a bit of history on their side—they were 32-0 all-time when leading 3-1 in a playoff series. That streak is over.  A perfect storm knocked Boston out early: Joel Embiid’s return gave the Philadelphia 76ers new life, the Celtics suddenly forgot how to shoot from deep, and Jayson Tatum’s untimely ankle/knee injury removed Boston’s biggest offensive safety valve in a pivotal Game 7. Just like that, the 2024 champions were bounced before Round 2.…