Despite back-to-back losses to close out a less-than-stellar week, the Boston Celtics held firm at No. 5 in this week's ESPN.com NBA Power Rankings. Boston remains tucked behind the Lakers, Bulls, Spurs, and Mavericks. Writes curator Marc Stein: "Didn't give too much thought -- even after a home loss to the Clips and defeat in Philly -- to booting the Celts out of the top five. Holding the Bucks to 56 points, however, was a wise way to make sure."