I agree, just straight fighter is a good fit here for your duelist. Picking carefully theres a good deal of single target powers that significantly hamper whoever they hit. Theres also a good selection of movement powers that let you get to and stick to your chosen target. While the damage you put out isn't ranger grade spectacular, you can build a character focused on picking a single enemy and cutting them down in single combat. With careful magic item selection and particularly if your target tries to get away you can go very respectable damage. You'll even have very competative defenses and attack bonuses.
I think this has been covered upthread, but the existing classes aren't as strongly pigeonholed into their roles as some people seem to think - they all have a secondary role as well, its just not strongly spelled out.
Its come up before but I think theres some truth in the idea that the secondary role is linked to power source - Divine classes do leadery type stuff, Arcane ones tend to the controller end while Martial ones tend to be more striker (or at least damage) oriented.
I think this has been covered upthread, but the existing classes aren't as strongly pigeonholed into their roles as some people seem to think - they all have a secondary role as well, its just not strongly spelled out.
Its come up before but I think theres some truth in the idea that the secondary role is linked to power source - Divine classes do leadery type stuff, Arcane ones tend to the controller end while Martial ones tend to be more striker (or at least damage) oriented.