as long as i can get them into a steel trap, i can use a combination of mine and grenades to take them out usually. only the really highly skilled players know to avoid it but many don't when they're running around like crazy. good Genjis were my greatest foes recently in Comp but with the dash nerf, it'll be better for me to trap them. i can do okay against Tracers unless they're super good. most tend to blink right into my trap for easy kills.
You have to get them in a trap though. What do you do about a player that just stands outside of mine/trap distance and strafes?
Either they walk into area denial and die (not a 1v1 situation), or Junkrat gets caught and dies.
Not dissing on Junkrat cause I think he's good at his job, just saying a good player won't get BSed by him in a 1v1.