Villain is a crappy reg, 22/7 over 350 hands. I left Player 3's stack size because i was attempting to isolate him on the flop.

I figure villain probably has a FD or A-x. He plays med strength hands passively, so i know he doesn't have a set and is not smart enough to go for a c/r as a bluff.

If i had A-7 i would check here, but does A-9 have enough value to bet here? Does A-7 actually have enough value to bet also? I don't know how often he has a pocket pair here, but i wouldn't think he would have 7-7 or something like that often at all.

Villain: ($271.70 in chips)
Hero: ($212 in chips)
Player 3: ($48.05 in chips)

*** HOLE CARDS ***
Dealt to Hero: [Ah 9h]
Player 3: checks
Villain: calls $2
Hero: calls $2
Player 1: calls $1
Player 2: checks
*** FLOP *** [3s As 4c]
Player 1: checks
Player 2: checks
Player 3: bets $6
Villain: calls $6
Hero: raises $42 to $48
3 folds
Villain: calls $42
*** TURN *** [3s As 4c] [6d]
Villain: checks
Hero: checks
*** RIVER *** [3s As 4c 6d] [Kh]
Villain: checks
Hero: bets $92