25/50 hu 200bb's with top pair and a, errr, draw

[chio]

Turn I can't see folding given it's an aggressive HU match in which your opponent has a wide preflop 3bet range.

And stack sizes make raising awkward as pot odds won't let you fold to a 3bet and shoving will allow him to a relatively easy decision, as he's calling with most better made hands and folding most worse ones.

So I like calling. HU your "draw" is worth something also imho