PokerStars - $0.02 NL FAST (6 max) - Holdem - 6 players
Hand converted by PokerTracker 4: http://www.pokertracker.com

Hero (BTN): 269 BB
SB: 49 BB
BB: 101.5 BB
UTG: 182.5 BB
MP: 94 BB
CO: 146.5 BB

SB posts SB 0.5 BB, BB posts BB 1 BB

Pre Flop: (pot: 1.5 BB) Hero has 7c Ac
UTG raises to 3 BB, fold, fold, Hero calls 3 BB, fold, BB calls 2 BB

Flop : (9.5 BB, 3 players) Ah 8c Qd
BB checks, UTG bets 4.5 BB, Hero calls 4.5 BB, fold

Turn : (18.5 BB, 2 players) 7s
UTG bets 18 BB, Hero calls 18 BB

River : (54.5 BB, 2 players) 2s
UTG bets 157 BB and is all-in, fold

UTG wins 52.5 BB

Ignoring the preflop play, which had to be an autopilot misclick type of thing, otherwise I don't know why I would've called, can we call here on the river?
I just can't seem to put him on a value hand weaker than ours. Exept maby A2 which is the only time the line would kinda make sense. Even then why would he open a2? I can't see him shoving his AK or AJ. AQ has me beat, so does AA, QQ. He wouldn't shove KK. Then there's the chance he might be bluffing, but then there are no draws he could've missed and turning a mid pair type of hand into a bluff just doesn't make any sense.