Tatum made 14 of 22 shots from the floor -- including 4 of 8 from 3-point range. He also had seven assists for the second-seeded Celtics, who trail 3-1 in the best-of-seven series heading into Thursday's Game 5 in Boston
Jaylen Brown scored 17 points and Derrick White added 16 to help the Celtics prevent Miami from becoming the second eighth-seeded team to advance to the NBA Finals. The 1998-99 New York Knicks accomplished the feat during a lockout-shortened season
Boston shot 51.2 percent from the floor (43 of 84) for the game and 40.9 percent from 3-point range (18 of 44).
Miami's Jimmy Butler overcame a slow start to record 29 points and nine rebounds. Gabe Vincent scored 17 points and Caleb Martin added 16 off the bench for the Heat, who fell to 6-1 at home in the playoffs
Down by 11 points late in the third quarter, Miami trimmed the deficit to five before Boston countered by scoring 12 straight points to secure a 100-83 lead with 7:25 to play in the fourth. Tatum and Marcus Smart each had five points during that surge.
Max Strus sank a 3-pointer to stake Miami to a 61-52 lead early in the third quarter before Boston ignited an 18-0 run. Tatum converted twice from beyond the arc and added a jumper during that sequence.
The Heat pulled within 81-77 before Tatum made a jumper and a layup and Williams sank his fourth 3-pointer of the night
--Field Level Media