Key matchups, players to watch and a series prediction as the Celtics and Knicks square off in the Eastern Conference semifinals.

The regular-season rivalry wasn't very much of a rivalry, as the Celtics won all four matchups. Boston won the first three games by 23, 27 and 13 points, respectively, before taking the final showdown, 119-117, in overtime back on April 8 in New York.

The New York Knicks made major moves to bolster their roster, adding Karl-Anthony Towns and Mikal Bridges, in the hopes of contending for an NBA title.