Is this an automatic fold? Or do I have a shot

[Rounder041]

party 5/10 (6 max) 5 players at the table, no reads on the table, just sat down.

Hero is BB with A7o
UTG limps, everyone folds, BB checks

Flop: 8d 2s Th
Hero checks, UTG checks

Turn: As
Hero bets, UTG calls

River: 9h
Hero bets, UTG RAISES

Do I call this raise? I don't put him on anything I can beat here. He obviously has top pair questionable kicker beat right? for him to call a turn bet, he has to have at least a pair or some sort of straight draw, I doubt he would raise if he catches a pair of nines, considering I could easily be betting as if I have a T or an A. Comments on all streets is apreciated.

[NLSoldier]

You may want to consider a raise preflop or a flop bet. Limping UTG he could have pretty much anything. When he calls the turn and raises the river I think you can safely fold. T9, QJ, A8, A9, 98, and 67 are all hands that someone could concievably play the exact way he played the hand.

[Rounder041]

Thanks for the input, I will consider the preflop raise/flop bet. He had me smoked by the way, TT for the flopped set.