It ain't Tyreek Hill or Micah Parsons ... no, DK Metcalf says he's the fastest man in the NFL -- telling TMZ Sports he'd dust Hill, Parsons and anyone else in the league in a race.
The Seattle Seahawks superstar made the claim while touring Nate Diaz's Represent headquarters in Fullerton, Calif. this month ... saying flat out no one is faster than him.
In fact, Metcalf laughed at the idea that he'd lose a race to Hill -- telling us, "Yeah. I can beat Tyreek Hill in a race.