88, A7, A3, plus the unlikely 77 and 33 all beat you here and are feasible hands. This is $10NL, so you have to add some non-feasible hands in there as well. But, as you say, 99-KK may also play like this.

My big problem here is that there are TWO pairs on the board. If he has hit one of them, then no matter how shitty his hand, you're dead. 3 is very unlikely, cos what could he have had to call pre-flop and flop - but 7 is definitely possible.

I think his river bet was well handled, the kind of size where an overpair is baffled and might call, might fold, might even re-raise. I think you played fine, pretty much, but came up against a monster.