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The Grizzlies led 25-12 after the first quarter behind nine points from Gay. By halftime, the lead was 48-32, the second-lowest scoring first half for the Heat since the first game of the Big Three era, the opener at Boston last season.

“They did a great job,” said Wade, who noted he feared even during the pregame layup line that energy was going to be lacking. “We beat ourselves as well. … Just one of those nights.”

Just about every number imaginable for the Heat in the early going was bad.

Wade missed two dunks in the first half, shooting 1 for 7. Midway through the second quarter, Bosh was shooting 4 for 5 and Harris 2 for 2 off the bench _ while everyone else in a Miami uniform was shooting 1 for 17 at that point.

There were chances in the third for Miami to get the lead into single digits, all of them thwarted.

The first one came when Conley stole the ball from Mario Chalmers, a sequence capped by Quincy Pondexter getting a dunk. And then about 3 minutes later, Miami endured maybe its most frustrating possession of the night.

James spun and tried a left-handed layup with 4:25 left in the third, the ball rimming out but Miami’s possession extended when Joel Anthony was fouled going for the rebound. James then attacked the lane for a jumper that missed, with the Heat getting that rebound as well and Harris finding James underneath the rim.

His layup _ his third shot of the possession _ came up short, a microcosm of Miami’s night.

“I just absolutely missed it,” James said. “It was a (tale) of what type of game we were playing.”

Arenas‘ fourth 3-pointer of the night came with 9:40 left, giving the Grizzlies an 81-64 lead. Mayo stretched the lead to 86-66 with another 3-pointer midway through the fourth, and the Grizzlies soon finished it off.

“We knew they were going to make a run but we withstood it,” Randolph said. “We kept playing and got stops.”

NOTES: Memphis’ 13-point edge was the biggest lead by a visitor in Miami after the first quarter since San Antonio led 29-14 after the opening 12 minutes at the Heat on March 16, 2010. … Memphis guard Tony Allen was not with the Grizzlies, out because of a facial laceration suffered in Dallas on Wednesday night. … Harris, who has impressed the Heat of late, got first-quarter minutes for just the third time this season.