Warriors join Bill Russell's Celtics in NBA history by reaching fifth straight Finals originally appeared on nbcsportsboston.com After sweeping the Blazers Monday night to advance to their fifth straight NBA Finals, they joined Bill Russell's Celtics as the only teams to make five in a row. The Warriors will look to win their fourth championship in five years and join an elite club of teams to complete a three-peat. From 1957-66, the Celtics won nine NBA titles, including a run of eight consecutive championships from 1959-66.