Donovan Mitchell stars as the Cleveland Cavaliers beat the Boston Celtics 115-111 while LeBron James leads the Los Angeles Lakers to victory.

Donovan Mitchell scores 20 points in the fourth quarter during the Cleveland Cavaliers' win over the Boston Celtics.

The Cavaliers found themselves in a familiar position down 14 to the Celtics in the third quarter Sunday, but unlike last spring's East semis, they did not back down -- thanks largely to the efforts of Donovan Mitchell,