Brittney Griner was emotional in Russian court on Thursday ... apologizing for "my mistake that I made," while pleading with the judge to hand down a light sentence.
Griner issued the mea culpa at another hearing in her drug case ... telling the Moscow courtroom she was deeply sorry for inadvertently packing hashish oil in her luggage back in mid-February.
"I want to apologize to my teammates, my club, my fans and the city of [Yekaterinburg] for my mistake that I made and the embarrassment that I brought on them," the WNBA superstar said.