Blueface and UK bad boy TikToker Ed Matthews are fighting in a week ... and the social media star from across the pond isn't looking to put in a full night's work -- he says he'll starch the American rapper in the first round!
TMZ Sports talked to 19-year-old Matthews earlier in the week ... just days after the bout was added to the Kingpyn Boxing card, going down April 22 at OVO Arena Wembley in London, Ed's home turf.
"It's a big fight, obviously a lot's on the line.