BOSTON, MA - MAY 23: Head coach Brad Stevens of the Boston Celtics reacts in the second half against the Cleveland Cavaliers during Game Five of the 2018 NBA Eastern Conference Finals at TD Garden on May 23, 2018 in Boston, Massachusetts. NOTE TO USER: User expressly acknowledges and agrees that, by downloading and or using this photograph, User is consenting to the terms and conditions of the Getty Images License Agreement. (Photo by Maddie Meyer/Getty Images)