AP Basketball Writer
NEW YORK (AP) -- Rajon Rondo was unable to join his team Friday as planned, stuck in Boston while the city was in lockdown.
He arrived in New York on Saturday, even offering his teammates some tips from the scouting report.
Unfortunately for the Celtics, he still can't play.
The Celtics badly missed their injured point guard Saturday, costing themselves a chance to win their playoff opener with a rash of mistakes in an 85-78 loss to the New York Knicks.
"Honestly, we turned the ball over a ton and I thought our spacing was horrendous in the second half," Celtics coach Doc Rivers said. "I thought we stopped trusting a little bit offensively."
Carmelo Anthony scored 36 points for the Knicks, but the Celtics held the NBA's scoring leader to 13-of-29 shooting and were generally pleased with their defense.
Their offense was a wreck.
"Very frustrating. We had a lot of turnovers tonight," guard Avery Bradley said. "As a team we don't want to turn the ball over."
Anthony had 10 quick points and endured a tough shooting night from there before scoring eight points in the fourth quarter, helping New York take a 1-0 lead in a series for the first time since the 2001 first round against Toronto.
"Boston knows Melo and they know he's not going anywhere, but they're going to make it as tough as possible for him to score the ball," Knicks coach Mike Woodson said. "And he got off to a good start and then he had that slow middle, and then when he had to pick it up down the stretch, he made the plays that we needed him to make. And I mean that's what the great ones do. They figure it out and Melo's done that all season for our ballclub."
Anthony made consecutive baskets late in the final period, when the Knicks held Boston to three baskets and eight points.
Game 2 is Tuesday night before the Celtics host Game 3 on Friday in what will be their first home game since the Boston Marathon bombings.
Jeff Green scored 26 points and Paul Pierce added 21 for the Celtics, who committed 21 turnovers that led to 20 points. The Knicks got their hands on the ball at will in the fourth quarter, when Boston shot 3 of 11.
Rondo is out for the season with a torn ACL, and Rivers said the Celtics realize teams will pressure them because they don't have a point guard.
"We had some just bad turnovers tonight," Rivers said. "If we had those turnovers in any game we probably should lose the game and we did. We were making post passes from the other side of the floor. I mean, those are just not good passes."
Kevin Garnett had eight points and nine rebounds but shot only 4 of 12 from the field. Jason Terry, another veteran on a young Celtics team, missed all five shots off the bench.
The Celtics led after three quarters and tied the game for the final time at 72 on Garnett's basket with 8:13 remaining. Anthony then made consecutive jumpers, and after the Celtics got back within three later in the period, he made a layup and a long jumper that gave New York an 83-76 advantage with 1:21 left.
Green made two free throws and the Celtics double-teamed Anthony, but he fired a pass to a wide-open Kenyon Martin under the basket to put it away with 40 seconds left.
"We just panicked a little bit. We don't have to do that," Bradley said. "We have to keep our composure and play the right way. We didn't."
J.R. Smith scored 15 points and Raymond Felton had 13 for the Knicks, while Martin finished with 10 points and nine rebounds in huge minutes for New York with Tyson Chandler struggling through a scoreless 20 minutes after barely playing late in the season because of a bulging disk.
The Knicks ended the Celtics' five-year reign as Atlantic Division champions by going 54-28, winning their first division title since 1994 with their most victories since going 57-25 in 1996-97. The next step would be playoff success for New York, which hasn't won a postseason series since 2000 and couldn't even get a game against the Celtics two years ago.
The Celtics wore a special patch recognizing the difficult week in Boston following the bombings that killed three people at the Boston Marathon on Monday. Rivers said many players were calling home to check on their families Friday, when the Boston area was in lockdown while authorities searched for the suspect.