All this capped off the Celtics ' best regular season ( 66-16 ) since their previous championship season in which they went 67-15.The Celtics ' win was also seen as an addition to the recent success of Boston-area sports teams , following the wins by the New England Patriots in Super Bowls XXXVI , XXXVIII , and XXXIX and the Red Sox 's World Series wins in 2004 and 2007 .
The Red Sox won the World Series in 2007 .