Kardashian Spin-Off Khloe & Lamar Coming To An End?

Sources tell TMZ, the show's second season will be its last ... because Lamar wants to focus on reviving his fizzling NBA career.

As we previously reported, Lamar was relegated to the Dallas Mavericks' inactive list after putting up career low numbers this season. If he's lucky, he'll be traded. If not, who knows ...

But we're told Lamar is determined to make a comeback -- and he feels he should focus on only one project. Lamar will be living in L.A. full-time and he's hired trainers to help him get his game back.