The Celtics have already accepted Game 6. Now, they get one final chance.

PHILADELPHIA — Jaylen Brown gripped the basketball and tapped it against his forehead in frustration. Hugo Gonzalez, who typically springs off the Celtics bench at the beginning of every timeout, tried to high-five Brown with his usual, 20-year-old jubilance. But, as Gonzalez’s hand slapped Brown’s, the Celtics star looked stunned, seemingly still processing a performance […]