Gervonta "Tank" Davis is winning in life ... the 29-0 fighter was gifted a $250K "Gumbo" chain minutes after knocking out Ryan Garcia, all to commemorate a new strain of weed named after the boxing superstar.
TMZ Sports has learned Davis recently signed a deal with cannabis company Gumbo Brands, who are releasing a strain called "Ape S***."
In the video, you see Tank smiling ear-to-ear as owners Alexis Majors and Karim "Luca" Butler put the expensive piece of bling -- a pendant and diamond tennis chain from Pristine Jewelers -- around his neck.