He totaled 14 points, six rebounds, two assists, one steal and one block.
Williams made 4-for-7 field goal attempts and 4-of-6 three-point attempts. He converted 2-of-2 free throw attempts.
Miami leads the best-of-seven series, 3-1.
Game No. 5 will be Thursday at TD Garden in Boston, Massachusetts. Tipoff is slated for 8:30 p.m. EDT and the game will be televised by TNT.
Williams played at Tennessee from 2016-19 and went to the NBA following his junior season as a two-time SEC Player of the Year.
He was a first-round selection by the Celtics in the 2019 NBA draft (No. 22 overall).
An offer for Vols fans
For the best local Tennessee news, sports, entertainment and culture coverage, subscribe to The Tennessean.
Source: Yahoo Sports