Dallas has two high-flying athletic big men, Dereck Lively II and Daniel Gafford, and both must be a considerable presence in the series for the Mavs to pull off the win. The Celtics are equally as deadly from inside the arc as they are from the outside, shooting a blistering 63.2% in the paint, first in the playoffs. Gafford and Lively must patrol the paint, avoid picking up silly fouls, and create scoring chances for their team with their offensive rebounding and rolling to the rim for easy dunks. Gafford is the better interior defender, but Lively is a better offensive player with his ability to facilitate out of the roll and make quick, decisive decisions to help the Mavericks offense run smoothly. It will be on head coach Jason Kidd to make sure he can balance the two and play them each in the right moments. Lively is expected to be good to go for Game 1 after missing Game 6 of the Western Conference Finals with a neck strain. He returned for Game 7, suffering another blow to the head, but stayed in the game.