BOSTON — A double-overtime victory against LeBron James and the defending NBA champions was difficult to celebrate for Paul Pierce and the Celtics.
News of Rajon Rondo's season-ending knee injury spoiled the party.
"Everyone was really happy for the win," Pierce said after Boston beat the Miami Heat 100-98 Sunday. "It brought a dark cloud in this room when you heard the news."
When coach Doc Rivers told his players after the game, the joy of ending their six-game losing streak stopped, even if they had just outlasted the team with the best record in the Eastern Conference, which came in with a four-game winning streak.
Now the Celtics must try to keep winning without their leader, who suffered a torn anterior cruciate ligament in his right knee late in Friday night's 123-112 win, also in double overtime, in Atlanta.
They won Sunday after Pierce's 22-foot jumper with 31 seconds left gave them a 99-98 lead.
But making the playoffs got harder as the Celtics try to hang on to the eighth and final postseason spot in the conference with a 2 1-2-game lead over the Philadelphia 76ers.
"Obviously, the Rondo news is pretty tough. I knew it before the game," Rivers said. "I just didn't think it was any time to tell any of our guys."
This game was the first in Boston for Ray Allen since he left the Celtics after five seasons and signed as a free agent with Miami. He scored 21 points.
Kevin Garnett had 24 points and 11 rebounds, and Pierce added 17 points, 13 rebounds and 10 assists for the Celtics.
Rondo's injury "puts this team and the rest of the guys in a position to be ready to step up," Pierce said. Sunday's win "was a perfect example. We showed we are capable."
James had 34 points for the Heat, whose winning streak stopped at four.
Lakers 105, Thunder 96
At Los Angeles, Kobe Bryant had 21 points, 14 assists and nine rebounds, Steve Nash added seven of his 17 points in the final 51/2; minutes, and the Lakers held off the NBA-leading Thunder.
Pau Gasol scored 16 points in a reserve role as the Lakers picked up the most impressive victory of their thoroughly unimpressive season, coolly maintaining a small lead down the stretch of their second straight win after a four-game skid.
Los Angeles had lost nine of its last 11 against the powerful Thunder, including four of five in the clubs' second-round playoff series last spring.
Kevin Durant scored 35 points and Russell Westbrook had 17 points, 13 assists and nine rebounds for the road-weary Thunder, who finished their longest trip of the season at 3-3.
Knicks 106, Hawks 104
At New York, Carmelo Anthony tied a franchise record with nine 3-pointers, then converted a go-ahead, three-point play with 12.5 seconds left to cap a 42-point night and lead the Knicks to the victory.
The Hawks shot a season-high 60 percent from the field but had their three-game winning streak snapped when Josh Smith, burned on Anthony's basket, missed a 3-pointer on Atlanta's final possession.
Amare Stoudemire and J.R. Smith each had 18 points for the Knicks, who were 16 of 27 (59 percent) from 3-point range. Raymond Felton had 12 points and 10 assists in his second game back after a 10-game absence with a broken right pinky.
Jeff Teague scored 27 points for the Hawks. Smith added 20 and Al Horford had 16.
Mavericks 110, Suns 95
At Dallas, Shawn Marion scored 18 points for Dallas in his 1,000th game, and Dirk Nowitzki also had 18 while passing Allen Iverson on the career scoring list.
It was the 10th straight home win for the Mavericks against the Suns, who haven't won in Dallas since March 14, 2007.
Nowitzki passed Iverson for 18th on the NBA's scoring list with a third-quarter jumper that stopped a Phoenix run, and his 3-pointer early in the fourth started a surge that put Dallas in control for good.
Phoenix rallied from a first-half deficit and made it interesting for a second straight night in Texas after losing at Western Conference-leading San Antonio. Goran Dragic led four players in double figures with 18 points.
Hornets 91, Grizzlies 83
At Memphis, Tenn., Ryan Anderson scored 22 points for New Orleans, connecting on seven 3-pointers.
Anderson was 7 of 13 from the field, all of his attempts coming from outside the arc. Fellow reserve Jason Smith was 5 of 7 from the field for 16 points, and Anthony Davis was the only New Orleans starter to finish in double figures with 10 points.
The Hornets had dropped consecutive games.
Zach Randolph led Memphis with 20 points and 13 rebounds for his league-leading 28th double-double. Marc Gasol had 14 points and 11 boards, and Jerryd Bayless also scored 14. Rudy Gay had 10 points, but was 3 for 17 from the field, including a 1-for-7 performance from long range.
New Orleans put the game away by outscoring Memphis 27-15 in the fourth quarter.
Pistons 104, Magic 102
At Orlando, Fla., Brandon Knight had a career-high 31 points, including five 3-pointers, and Greg Monroe scored 17 to lead Detroit to the road win.
The Magic had a chance to tie the game in the closing seconds after a missed free throw, but missed three putback attempts.
Orlando's J.J. Redick tied a career high with 31 points and set a career high with eight 3-pointers. Jameer Nelson had 18 points and eight assists, and Glen Davis added 17 points and 12 rebounds. The Magic have lost five straight games.