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The Bulls have been a top defensive team every season under coach Tom Thibodeau.
Defensive Efficiency (ESPN): 98.9 (4)
Adjusted Defensive Rating (Basketball-Reference.com): 102.72 (5)
Starters, Defensive Rating (Basketball-Reference.com)
Kirk Hinrich: 104
Rip Hamilton: 106
Luol Deng: 103
Carlos Boozer: 99
Joakim Noah: 97
Chicago had been the league's best defense the past two seasons before falling to fourth this season. Coach Tom Thibodeau has managed to keep the Bulls in the top five despite an almost completely revamped bench and injuries to many of their top players.
Thibodeau demands 100 percent effort every minute of the game from his team, but it is his defensive scheme that sets the Bulls apart from the rest of the league. As outlined by Zach Lowe of Grantland, Thibodeau's team defends the pick-and-roll differently than the rest of the league and forces teams into shooting long two-pointers, the least efficient shot in the game.
As far as their personnel, Joakim Noah, Taj Gibson and Luol Deng are all long, athletic forwards that can guard their men one-on-one while contesting shots from the help side.
Carlos Boozer has an individual defensive rating of 99, but it should be taken with a grain of salt. Boozer is almost always on the floor with Noah or Gibson, and he is always guarding the lesser of the two offensive post players. Also, he isn't a great individual defender, but Boozer does know his role in Thibodeau's scheme and communicates well to his teammates.
Just don't vote for him for Defensive Player of the Year.