Underrepped with trips good kicker - exploitable fold ?

Posted 9 years, 9 months ago

Blinds: $1.00/$2.00 (6 Players) BN: $217.16
SB: $304.97
BB: $204.42
UTG: $287.94 (Hero)
MP: $200.00
CO: $236.23

Small sample on hero he's likely a regular playing 29/25 over 170 hands with 9% call open.

Preflop ($3.00) Hero is UTG with A J

Hero raises to $5.00, MP calls $5.00, 4 folds

Flop ($13.00) A 5 7

Hero checks, MP bets $10.00, Hero calls $10.00

Turn ($33.00) A 5 7 A

Hero checks, MP bets $25.00, Hero calls $25.00

River ($83.00) A 5 7 A 8

Hero checks, MP bets $64.00, Hero calls $64.00

I ended up calling but I've got good reasons to believe this may be a fold despite being high in my range. Thoughts?