Riding the best game of Jared Sullinger‘s young NBA career, the Celtics  won a season-best fourth straight game, 87-79 against the Suns, and improved to 4-1 since Avery Bradley’s return on Jan. 2.
Sullinger (12 points) grabbed a career-high 16 rebounds to record the second double-double of his rookie season, as the C’s (18-17) climbed above .500 for the first time since Christmas Day.
In a balanced effort, Sullinger, Jeff Green  (14 points), Jason Terry  (13 points), Kevin Garnett  (10 points), Bradley (9 points), Rajon Rondo  (8 points, 8 assists), Paul Pierce  (7 points, 7 rebounds), Brandon Bass  (6 points, 5 rebounds) and Courtney Lee  (6 points) all scored between 6-14 points.
WHAT WENT RIGHT
Green machine: On back-to-back second-quarter possessions, Green threw down ferocious dunks on separate Suns to hand the Celtics a 38-33 lead and force a Phoenix timeout. The first came on a dribble drive over old friend Jermaine O’Neal , and he slammed the second on a fast break oop from Bradley over Michael Beasley.
Rotating schedule: Actually, the entire Celtics bench once again performed admirably. Green, Terry and Sullinger were the C’s three highest scorers as the reserves outscored their Suns counterparts 47-16. Bradley’s return has helped coach Doc Rivers  find some consistency in his rotations, and the Celtics appear to be responding to their more clearly defined roles.
On the defense: The Celtics are slowly climbing the NBA’s defensive ranks. After allowing 98.1 points per game through December, the C’s have gave up an average of just 86.3 points in Bradley’s first four games back. In his fifth, the Suns didn’t reach 70 points until 4:15 remaining in the fourth quarter. Even lineups that contain Green and Terry, who aren’t exactly known for their defensive prowess, appear to be grasping the C’s defensive schemes.
WHAT WENT WRONG
Dudley do right: Quietly, Boston College  product Jared Dudley  has carved out a nice NBA career for himself. He’s averaging double-digit points for the third straight season, shooting 40.5 percent from 3-point range in his five-year career and dishing out a career-high 2.7 assists per game. Against the Celtics, he amassed 14 points, 10 rebounds and five assists, doing all the little things to keep the Suns in the game.
Bigs problem: It wasn’t a matter of whether the length of the Suns frontcourt would hurt the Celtics; it was a question of how much. The 6-foot-11, 240-pound Marcin Gortat and 6-foot-9, 245-pound Luis Scola entered the game averaging 24.5 points and 15.1 rebounds between them, and they combined to surpass both those numbers against the Celtics (28 points, 22 rebounds). In all, the Suns totaled 50 points in the paint.
Aunt Chippy: Whether the Celtics instigate it or not, there’s been some serious chippiness in their recent stretch of games. Two games after Rondo’s suspension for bumping a ref and two nights after Carmelo Anthony grew infuriated with Garnett, Rondo and Suns forward P.J. Tucker logged technicals and both Green and Courtney Lee took hard falls to the parquet floor. While some of their success can be attributed to the intensity, there’s a line between aggressiveness and overaggressiveness, and the Celtics have been riding it.