Miami ? For LeBron James, Game 5 last season against Boston was horrific.

A year later, Game 5 was humbling.

And he and the Miami Heat are halfway to an NBA championship, having finally found a way to vanquish the Celtics.

Dwyane Wade scored 34 points, James added 33 — including the game’s last 10 in a spectacular closing flourish, part of Miami’s 16-0 run over the final 4:15 — and the Heat beat the Celtics on Wednesday night to win their Eastern Conference semifinal series in five games.

When it was over, James knelt on the court, oblivious to the photographers who quickly surrounded him in Miami’s celebration.

“Everything went through my mind at that point,” James said. “Finally getting over this hump against this team. Everything I went through this summer, with ‘The Decision’ and deciding to come down here to be a part of this team … because I knew how important team is to this sport … and all the backlash I got from it.

“I’d be up here for two hours if I tell you exactly everything that went through my head. Very emotional at that point, you know, and happy we got through it as a team.”

That they did — as a team.

James Jones hit a three-pointer that kickstarted the final push, and Chris Bosh finished with 14 points — none of them more important than the two coming when he blew past Kevin Garnett for a game-tying dunk with 2:57 left.

Wade carried Miami early, then James finished the job. His personal 10-0 run to close the game put some long-simmering Celtics demons to rest.

“I play with the two best players in the league,” Bosh said. “And we do this together.”

True, this was about the collective.

Ray Allen led Boston with 18 points. Garnett had 15 points and 11 rebounds, Paul Pierce scored 12 and Delonte West added 10.

“Right now, I am really upset,” Pierce said. “I wish I could have played better tonight. Unfortunately we came up on the short end of the stick. I tip my hat off to Miami. They really played great basketball.”

Thunder 99, Grizzlies 72

Oklahoma City — Kevin Durant scored 19 points, reserve Daequan Cook added 18, and Oklahoma City followed its triple-overtime triumph with a blowout of Memphis to take its first series lead in the Western Conference semifinals.

The Thunder lead 3-2 heading into Game 6 on Friday night in Memphis. They got there with ease considering what happened two nights earlier.

Marc Gasol had 16 points to lead Memphis.