Boston — Celtics point guard and Defensive Player of the Year Marcus Smart was ruled out for Game 4 of the Eastern Conference finals against Miami, joining Heat guard Tyler Herro on the sidelines for Monday night's game.
The Celtics said about an hour before the scheduled tipoff that Smart was out with a sprained right ankle. The Heat said Monday morning that Herro, who has a groin strain, would not play.
Boston coach Ime Udoka said All-Star forward Jayson Tatum would play; he left Game 3 on Saturday with a shoulder impingement but returned to finish the game, which Boston lost to fall behind 2-1 in the best-of-seven series.