Knockin' Up Khloe Could Help Tristan's Career, Says NBA's Jim Jackson

Tristan Thompson's Kardashian spawn ain't just gonna make him more famous ... it could damn well make him a better basketball player -- so says NBA vet Jim Jackson.

We got J-Jax at Cafe Gratitude in L.A. ... and he told us why knockin' up Khloe might translate to a fiercer Tristan on the hardwood.

"Having a child always settles you down a little bit," Jackson told TMZ Sports. "Maybe a kid settles him down and gives him more focus."

Seems like Jim isn't buying into the Kardashian curse -- basically saying TT should be good as long as he keeps handling business for the Cavs.