Big man leaves, star man rises

Al Horford has officially bid farewell to Boston, joining the Golden State Warriors on a multi-year deal and closing a major chapter in his Celtics career. Meanwhile, Jayson Tatum lifted spirits by posting his first on-court workout video just four months after Achilles surgery.

Fans were impressed — even Kevin Durant reacted — and if Tatum’s comeback gets any stronger, Boston might have to start drug testing his sneakers instead of him.