Updated

LeBron James got his ring and then went out and played like a king.

Although he missed a majority of the fourth quarter with leg cramps, James tallied 26 points and 10 rebounds in the defending-champion Miami Heat's 120-107 victory over the Boston Celtics on NBA's opening night.

The 2012 NBA and Finals MVP exited the game late in the third quarter with cramps, came back at the start of the fourth and made a deep jumper to give Miami its largest lead, and then exited again shortly thereafter.

It's been a big year of accolades for James, who went 10-of-16 from the floor. He led the U.S. to another gold medal at the Summer Olympics in London.

Dwyane Wade netted 29 points, while Chris Bosh added 19 points and 10 boards for Miami, which knocked off the Celtics in seven games during the Eastern Conference finals.

Paul Pierce scored 23 points and Rajon Rondo registered 20 points and 13 assists for Boston, which won last season's season series between its heated rivals, 3-1.