Al Horford wakes up Celtics to take down Cavs, advance to Eastern Conference finals

BOSTON — When Jayson Tatum first got to the NBA, Al Horford was in his prime. Horford has made a career of being the metronome that keeps his team running, having a sense for when the team needs cool and when it needs fire. The Celtics players talk about never being too high or too low. They learned it all from Horford years ago. Advertisement But this isn’t his team anymore. He ran things when Tatum and Jaylen Brown were …