Rajon Rondo  dished out a season-high 18 assists to go with 11 points and the Celtics  rode a red-hot third quarter from the field to post a 118-111 win over the Pistons Sunday night at TD Garden. Jeff Green  scored 27 while Kelly Olynyk provided a big first-half spark off the bench, scoring 13 of his 18 points in the opening 24 minutes.
Rondo’s 18 helpers were all the more remarkable considering he had no turnovers, just two assists shy of matching the NBA record for assists in a game without committing a turnover, achieved three times.
Kris Humphries added his sixth double-double of the season, scoring 20 points on 9-of-13 shooting, while grabbing 10 rebounds. The Celtics  improved to 22-41, winning consecutive games for the first time since beating Orlando, Philadelphia and Sacramento to open February. Josh Smith led Detroit with 28 while Greg Monroe added 22 for the Pistons, who fell to 24-39. The Celtics  are just five games out of the eighth and final playoff spot in the Eastern Conference with 19 games remaining.
As was the case in Friday’s win over the Nets , the Celtics  took a lead after the first quarter and were in command most of the way. Jared Sullinger’s layup with 31.3 seconds left in the first gave the Celtics  a 24-22 lead, an advantage they would not relinquish.
Green scored 11 of his 27 in the second quarter as the Celtics took 57-49 halftime lead.
The Celtics came out blazing hot in the third, making 11 of their first 16 shots to open a 17-point lead. After shooting just 2-for-14 from long range in the first half, the Celtics drilled 8-of-12 from long range to put up 31 points in the first nine minutes of the quarter. The Celtics, thanks to 68 percent (15-of-22) shooting, scored 38 points in the quarter taking a 95-84 lead into the fourth.
The 38 points was the third-highest total in any quarter this season, behind the 42 in the first quarter against the Pistons on Dec. 18 and the 39 against the Bucks on Dec. 3.
While the Celtics were on fire offensively, they were leaking oil badly on defense, allowing 35 points as Detroit kept the game within range by shooting 60 percent from the field.
The 73-point quarter was a throwback to the old days of the ABA when little defense was played and open shots were the norm.
Green’s ill-fated behind-the-back pass to Will Bynum  set up a Pistons fast break layup and three-point play on the other end as the Pistons drew to within eight, 95-87, in the opening 90 seconds. The two teams went back and forth. Josh Smith hit a three with 4:43 left to cut the Boston lead to nine before Jeff Green  answered on the next possession.
Another Smith three cut the lead to eight, 111-103 with 2:53 left. Will Bynum  hit two free throws with 2:29 left to make it 111-105. Rondo found Humphries under the basket for a nice reverse layup to make it 113-105. Bynum converted another pair of free throws with 1:10 left to make it a six-point game. His two free throws with 48.2 seconds left cut the lead to four, 113-109.
The Celtics will leave Monday after practice for a game at Indiana Tuesday night. They return to Boston to play the Knicks on Wednesday night at TD Garden. Head coach Brad Stevens  indicated before the game that Rondo will likely not play in the second game of back-to-backs the rest of the season  and is expected to sit out the Knicks game if he plays Tuesday night.