Tristan Thompson Awarded $50k in Libel Case Against Paternity Accuser

Tristan Thompson's pockets could get a little more swollen soon ... he's just been awarded a nice chunk of change in the libel case against his paternity accuser.

According to legal docs, obtained by TMZ, the court has entered a default judgment in favor of Tristan against Kimberly Alexander for the amount of $50k ... plus 10% interest per year until it's paid off. She's also gotta fork over $2,901.75 in court costs.

TMZ broke the story ... Tristan was headed to a victory after the court said it was leaning towards awarding Khloe's ex more than $50k. He sued Alexander for libel last year and wanted $100k in damages after claiming her allegation he fathered her child hurt his reputation, and cost him endorsement deals because companies saw him as a brand hazard.

The judge ultimately slashed the damages in half because Tristan didn't specifically lay out which endorsements he lost due to Alexander's allegations.