LeBron James offered no excuses for the Los Angeles Lakers' display in their heavy defeat to the Boston Celtics, labelling it a "good, old-fashioned butt whooping."

The Lakers went down 139-107 to the Celtics on Monday - only the seventh time in the history of the regular-season rivalry between the Lakers and Celtics in which the margin of victory has been 30 points or more.

It was also the largest win by one team over the other since the Lakers beat the Celtics by 35 points in March 1969 and James knows his side were not up to scratch.

"I mean, listen, it was just a good, old-fashioned butt whooping," James said, in quotes reported by ESPN.

"That's all. They beat us in all facets of the game: outside, interior, points off turnovers, offensive rebounds. So, it's the main ingredients in the loss.

"We haven't moved on yet. [Tuesday], we will. Still simmering right now, which it should. But it's a long NBA season. You don't want to have games like this, but if you do, you try to learn from the mistakes. Or you do learn from the mistakes, and you move on."

Monday's big win for the Celtics was also a huge moment for Kemba Walker, who finally ended his career-long losing streak against James - a run which had lasted 28 games.

Walker, who scored 20 points in the win, kept his cool when asked about snapping the unwanted streak.

"I'm happy I got one at least, before he goes," Walker told reporters. "Who knows how long he can play, because he's just incredible. But you know, it's only one. One and 28.

I know everybody is making a big deal of the record. I have the utmost respect for LeBron and he's one of the greatest players of all time. If there was any guy I couldn't beat, it'd be him.

"He's such a great player, done so much in this league, has been so far. It just feels good to win. I'm more excited about the way we played, the way we came out, especially with the struggles we've had in the last couple of weeks, that's what I'm more excited about."