MIAMI (AP) ― LeBron James finally got a Game 7 victory, on his third try.

Next up, the NBA Finals ― and his third try at that elusive first championship.

James had 31 points and 12 rebounds, Chris Bosh hit a career-best three 3-pointers ― the last sparking the run that put it away ― and the Miami Heat won their second straight Eastern Conference title by beating the Boston Celtics 101-88 in Game 7 on Saturday night.

Miami opens the title series in Oklahoma City on Tuesday night.

Dwyane Wade scored 23 and Shane Battier added 12 for the Heat, who won a Game 7 for the first time since 2004 ― Wade’s rookie season.

Rajon Rondo finished with 22 points, 14 assists and 10 rebounds for Boston, which got 19 points from Paul Pierce in what might be the last game of the “Big Four” era for the Celtics.

Boston took out its starters with 28.3 seconds left. By then, workers already had a rope around the perimeter of the court, preparing for the East trophy presentation.

When Heat president Pat Riley was shown on the giant overhead video screen in the moments just after the final buzzer, the crowd screamed. Riley finally acknowledged them with some claps, before the 2012 Eastern Conference champions logo was shown as players below the scoreboard high-fived and hugged, all wearing the new T-shirts and caps that marked the accomplishment.

The screams kept coming, first when Alonzo Mourning took the microphone ― “We still got a lot of work to do,” Mourning said ― and then again when he handed the trophy to Heat owner Micky Arison.

“A roller-coaster ride,” Arison said.

A roller-coaster game, too. In a roller-coaster season.

All worth it ― for now, anyway. The next step awaits, another shot at the finals. In a championship-or-bust season, the Heat board a plane for Oklahoma City on Sunday.

“We have been through a lot,” Heat coach Erik Spoelstra said.

Down by seven at the half and eight early in the third quarter, Miami started clawing back. An 8-0 run tied it 59-59, capped by Wade hitting a jumper, and then the fun really started.

There were six lead changes and five more ties in the final 7 minutes of the third. Bosh scored with 29 seconds left for the last of those ties, and it was 73-all going into the fourth.

Six games decided nothing, and nothing was decided in Game 7 until the very last moments, neither team yielding much of anything. Battier’s 3-pointer with 8:06 left in the third cut Boston’s lead at the time to 59-57.