The Celtics outscored the Hawks 33-9 in the third quarter on Saturday en route to a 89-81 win that handed Atlanta its second loss in a row.
After the game, Atlanta head coach Larry Drew said he was "concerned" about his team's play and called the loss the "most disappointing" of the season, according to Chris Vivlamore of the Atlanta Journal Constitution.
Drew's disappointment resulted from his team's inability to match Boston's physicality and toughness. Drew feels that when "you play against teams that do smack you, you have to respond."
The Celtics trailed 53-38 at halftime before a huge third quarter catapulted them to a win. Paul Pierce had 26 points and nine rebounds for the Celtics. Kevin Garnett and Rajon Rondo each had 14 points for Boston.
The Hawks have now lost six of their last nine games against the Celtics, including a first-round playoff series loss last year.
Atlanta has now lost two straight and three of its last four games.