Marreese Speights registered 16 points and five rebounds in the Warriors' opening-night win over the Kings.
He played just under 18 minutes in that game.
Over Golden State's next five contests, Speights averaged four points and two rebounds in nine minutes.
On Sunday night in LA, the 27-year old power forward/center registered 24 points and nine rebounds in over 20 minutes off the bench.
"My new favorite player, Mo Speights," Kerr said to reporters following the Warriors' 136-115 victory over the Lakers. "He's amazing. He just keeps producing every time we throw him out there.
"I sort of kept him on the bench for a lot of the preseason. We've been trying to develop our two young bigs, Festus and Kuz, and giving them every opportunity.
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"I knew Mo would stay ready cuz he's a pro and we know what he can do, but the production he's given us is remarkable, and he's earned that backup role and he's gonna play a lot for us. He should anyway."
What's the key for Speights to maintain this level of play?
"I think for Mo it's the defensive activity that will keep him on the floor," Kerr answered. "We know he can shoot, we know he can make shots. But when he's active defensively like he's been the last few games, when he's engaged, he's on the glass, that will allow him to stay on the floor because it will allow us to play the defense we want to play."
Over his last four games, Speights is averaging 14 points and 6.5 rebounds in 16 minutes a night.
The Florida Gator product is making $3,657,500 this year.
The Warriors hold a club option at $3,815,000 for next season.