NL100: Should i fire the 3rd Barrel here

[Panthro]

you needs a read sir. Unknowns generally don't/won't fold Top pair.

[RapidEvolution]

I'm giving up on the river here. It's likely that he either has an ace that he's not letting go of, or something that beats TPTK. The board's dry so there aren't too many missed draws on this river that'd fold to a bet. If you've been really busy preflop (just an impression I got from the raise with 76s UTG), then it's even more likely that you're getting looked up here.