TMZ has learned ... LeBron James and his mother Gloria James are being sued for millions by a man who claims he tried to prove he's the NBA star's biological father -- but LeBron and his mom tampered with the evidence in a diabolical cover-up.
The lawsuit is explosive -- in it, 55-year-old Leicester Bryce Stovell claims he met Gloria in a D.C. area bar in 1984 ... and had unprotected sex with her on the night they met.
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