Jayson Tatum scored 51 points — 48 of them in the first three quarters — and the Boston Celtics breezed to a 116-87 victory over the Washington Wizards on Sunday. Tatum made nine 3-pointers and shot 18 of 28 from the field. He had 31 points by halftime and reached 50 on a drive to the basket with about 4:30 remaining in the game.