G.S. Warrior star Kelly Oubre claims his ex-GF tried to extort him out of nearly $3 million ... and if he didn't pay up, she'd launch a smear campaign intended to destroy his reputation.
The allegations are part of a lawsuit filed by the 25-year-old hooper in Los Angeles.
Oubre -- a 6 year NBA vet who was a former 1st round draft pick -- claims his ex, Makena LeDuff contacted him on January 11, 2021, and demanded a large sum of money ... or she would retaliate against him.
"Makena demanded that Kelly her pay her nearly $3 million or she would make public her false, scurrilous, and extortionate allegations by the end of the week," the lawsuit reads.