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

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

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,