NBC broadcaster Leigh Diffey is opening up on wrongfully declaring Kishane Thompson the winner after the Olympic men's 100-meter race on Sunday ... owning up to his error and congratulating Noah Lyles on his accomplishment.
Diffey -- who has been catching heat for botching the American sprinter's big moment -- went to X to address the mistake ... saying he "got it wrong" following the insane photo finish that saw Lyles squeeze out the victory by 0.