[Sykes]

I think this seems fine depending on your capping range. If you cap with 88+/AJ+/KQ+ in this situation.. although if that's true, what's he betting the river with that you beat?
A random 9(like J9/T9)? Unlikely.

I think I agree with Baron here in folding the river since I can't see you beating anything that he bets the river with.

Although I prefer betting the turn and folding to a check/raise.