BOSTON — Rajon Rondo had a triple-double with 17 points, 14 rebounds and 12 assists to lead the Celtics to a 90-84 overtime victory over the Atlanta Hawks on Friday night and give Boston a 2-1 lead in the first-round playoff series. It was the seventh career playoff triple-double for Rondo, who missed Game 2 because he was suspended for bumping a referee in the closing minutes of the series opener. Game 4 is Sunday night.