Los Angeles Lakers head coach David Fizdale lamented that LeBron James' effort is being "wasted on losses" after slipping to a 122-115 defeat against the Brooklyn Nets on Christmas Day.

The loss was the Lakers' fifth straight defeat and saw them slump to a disappointing seventh place in the Western Conference with a 16-18 record.

However, James put in another terrific individual performance – scoring a season-high 39 points, the fourth game in a row in which he has broken the 30-point barrier – and Fizdale revealed his frustration at not being able to capitalise on his star's strong showings.

"I'm kicking myself in the head because he's giving me incredible effort," Fizdale said after the game. "[I'm] trying to figure out ways to get him over the hump with that effort, and I hate that it's wasted on losses. Just spectacular.

"But to watch it, to be a part of it, even though those games are turning into L's, I've never seen anything like this guy. And we better sure as hell be thanking our lucky stars for this guy."

While James' individual display could hardly be faulted, the same could not be said of fellow Lakers star Russell Westbrook, who managed just 13 points on Saturday.

James defended the point-guard's performance, however, focusing instead on the effort his team-mate put in during the game.

"He gave us extra possessions, he gave us a lot of looks around the basket, which I know that he can't stand [failing to convert] as well," James said.

"But as far as the effort piece, if a guy plays hard, if a guy leaves it all out on the floor, I've got no problem with that. It's a make-or-miss league."

Fizdale agreed that the 33-year-old Westbrook could not be criticised for lack of effort, and suggested that taking some pressure off himself would lead to an improved scoring record.

"A big part of it is he just wants it so bad," Fizdale said. "I mean, you can just see it in him, everybody does. He wants it so bad. And I know that's just hard for him when it doesn't work out. And I know he cares like crazy.

"I just want him to take a lot of that pressure off himself, keep attacking, keep playing the way we know he can."