Dwight Howard and Steve Nash joined a team that already had Kobe Bryant and Pau Gasol.
Gasol scored 16 in the second half as Memphis remained unbeaten at home in the postseason.
After shipping Lamar Odom to Dallas, they have Kobe Bryant, Pau Gasol and Metta World Peace.
Gasol added 17 points, Allen had 16 points and 10 rebounds, and Randolph had 13 points.
Craig Sager, a member of NBC's broadcast team, approached Gasol for comment while he was stretching.
Gasol scored six straight points to pull the Lakers into the first tie of the quarter.
Bryant urged Gasol to position himself down low where he's most effective and stay put.
Marc Gasol, who missed the previous two games with an abdominal tear, finished with 13 points.
But Gasol, who scored just eight points in the first half, then took complete command.
Most would agree that Pau Gasol and Andrew Bynum failed to consistently play to their potential.
"We cannot be fully happy because it looks like Pau Gasol suffered a serious injury, " he said.
BBC: SPORT | Other Sport... | Basketball | Greece oust USA in massive upset
Dwight Howard had 20 points and 15 rebounds and Pau Gasol added 16 points and 16 rebounds.
Gasol added that he learned the deal was official just minutes before Spain's semifinal win over Russia.
They'll vie for Olympic gold Sunday against Spain, led by Pau Gasol of the Los Angeles Lakers.
The starting lineup of Bryant, Howard, Gasol, World Peace and Steve Nash fell to 0-6 this season.
Gasol's presence, as one of the league's upper-echelon big men, figured to change the scope of the game.
Gasol, the tournament's top scorer who averaged 26.7 points in the first three games, finished with 25 points.
Lopez was faced with Pau Gasol in Howard's absence and the first-time All-Star was up to the challenge.
The Los Angeles Lakers are loaded with such talent as Kobe Bryant, Steve Nash, Dwight Howard and Pau Gasol.
When Shaq left, they drafted Andrew Bynum, a talented young center, and traded for Pau Gasol, an all-pro forward.
Injuries sidelined both Gasol and Nash for 40% of the season and Howard struggled to recover from 2012 back surgery.
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"If you're up 3 and you've got a minute and a half, you've got to get a stop, " Gasol said.
He is likely to come cheaper than borderline star-powerhouses Tyson Chandler and Marc Gasol, something many teams will be interested in.
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Then Gasol picked up his second foul with 9:02 left and went to the bench for the rest of the half.
After Paul's basket, Marc Gasol tied it again when Mike Conley found him alone for a dunk to make it 91-all.
Gasol had four points and eight rebounds playing limited minutes after missing more than six weeks with a right foot injury.
However, their joy was tempered by the news that star player Pau Gasol could miss the final because of a foot injury.
BBC: SPORT | Other Sport... | Basketball | Greece oust USA in massive upset
And, oh by the way, the Lakers were able to get this deal done by keeping Pau Gasol and moving Andrew Bynum.
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"We've got to really, really step up and execute better, " Gasol said.
"I'm telling him, 'Look, I'm trying to be focused here, '" Gasol recalled.
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