Alex Len’s three-point play with 54.1 seconds left broke an 80-80 tie and lifted the Suns over the Celtics , 87-80, Friday night at TD Garden. Kris Humphries led the Celtics  with 11 points and 13 rebounds. The Celtics  lost their third straight and fell to 22-44 on the season.
Cold shooting from the field put the the Celtics in an early hole, falling behind by as many as 11 in the opening minutes of the second quarter. But strong rebounding, led by Kris Humphries, allowed Boston to work their way back in, cutting the halftime deficit to two, 46-44.
The Celtics again went cold from the floor in the third quarter, making just four of their 20 shots from the field. As a result, Phoenix grabbed a 61-53 lead with 3:24 left in the third. But the Celtics again showed their resiliency, cutting to the deficit to just four, 64-60 heading into the fourth.
The Celtics continued that momentum by scoring the first nine points of the fourth quarter to cap an 11-0 run and grab a 69-64 lead, matching their biggest lead of the game.
Phoenix came back with the next six points to take a 70-69 lead. The Celtics led 78-75 before the Suns scored five straight, including the go-ahead basket, a turnaround jumper by Markeiff Morris with 2:30 left, putting Phoenix up, 80-78. Jeff Green ‘s two free throws with 2:02 left tied the game again, 80-80.
After Len’s three-point play, the Celtics could not get off a shot close to the basket and the Suns put away the game with two breakaway layups.
The Celtics are off Saturday and begin a brief two-game road trip Sunday evening in New Orleans. They play in Dallas Monday night before returning home to play the Miami Heat  Wednesday night at TD Garden.
WHAT WENT WRONG
Cold feet: The Celtics shot just 37.5 percent from the floor in the first half, making just 18-of-48 shots, including 2-of-12 from long range. Good defense and Phoenix sloppiness kept the Celtics in it, as Boston trailed by just two, 46-44 at the half. It didn’t get much better in the third quarter as the Celtics shot just 20 percent on 4-of-20 shooting.
Gone fishing: There are games where Brandon Bass  can take over and find his shots in the paint and under the glass seemingly at will. Then there’s nights like Friday. He started but never got into a rhythm, scoring just eight points on 4-of-12 shooting, playing 21 minutes. Part of this was due to the fact that coach Brad Stevens  elected to go with a smaller, three-guard lineup of Rajon Rondo , Avery Bradley  and Chris Johnson  for the better parts of the second and third quarters. Throw in the continued emergence of Kelly Olynyk and guards Jerryd Bayless and Phil Pressey and there was little time left for Bass.
Green-out: Like Bass, Jeff Green  can look like a world-beater one game and come out with a dud the next, like Friday. He had just nine points in 36 minutes on 2-of-14 shooting.
WHAT WENT RIGHT
Bradley’s back: Avery Bradley  returned to game action for the first time since injuring his ankle Feb. 9 against Dallas. The team’s shutdown defender came off the bench with 3:24 left in the first quarter. With 5:09 left in the third, Bradley showed his offensive skills, getting into traffic, knocking down a 10-footer and drawing the foul for a three-point play. He finished with nine points in 17 minutes.
On the rebound: The Celtics attacked the glass with authority in the first half outrebounding the Suns, 27-24. Leading the way with six in the first half was Kris Humphries, who grabbed six of his xx for the game in the opening half. Humphries finished with his seventh double-double of the season, scoring 11 points while grabbing 13 rebounds.
Balancing the scales: The only player not to get into the scoring column in the first half was Chris Babb, the undrafted rookie out of Iowa State who was signed to his second 10-day contract on Monday. Even Joel Anthony  got into the mix for the first time since playing four minutes against Golden State on March 5 and scoring two points in the first half, his first points since netting four against Atlanta on Feb. 26.
Rondo passes knee test: With about seven minutes left in the third quarter, Rondo drove to the left side of the basket for one of his patented dishes under the basket but he lost his footing, slipping to the court. His knee was protected by the black ACL brace he wears and he remained in the game and played the remainder of the third quarter with no apparent ill effects.