Tatum and Jaylen Brown played the entire second half as Boston fought back against a feisty Philadelphia squad that shot 46.9 percent from 3-point range without three usual starters including Joel Embiid and Paul George. Ultimately, Boston’s hot shooting and improved defensive intensity turned the game around after Mazzulla’s halftime speech.

The Celtics overcame a 26-point second-half deficit and beat the short-handed 76ers 118-110 in Philadelphia on Sunday.