NL50 - tough river decision with TPTK

[Ramana]

Villain is 26/6/1.5

Prima Network No-Limit Hold'em, $0.50 BB (6 handed) Hand History converter Courtesy of PokerZion.com

SB ($6.71)
BB ($84.95)
UTG ($112.37)
Hero ($49.69)
CO ($42.85)
Button ($132.24)

Preflop: Hero is MP with A[img]/images/graemlins/club.gif[/img], Q[img]/images/graemlins/spade.gif[/img].
<font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises to $2</font>, <font color="#666666">1 fold</font>, Button calls $2, <font color="#666666">2 folds</font>.

Flop: ($4.75) 9[img]/images/graemlins/club.gif[/img], 7[img]/images/graemlins/heart.gif[/img], Q[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $3.11</font>, Button calls $3.11.

Turn: ($10.97) J[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $7</font>, Button calls $7.

River: ($24.97) 4[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">Button bets $18</font>, Hero ???

[ICMoney]

You've shown strength pf and on flop/turn.

I don't see you being good here.
He called pf IP and I would think he hit two pair or a set on flop. Maybe a turned straight.

River flush is a blank as far as I'm concerned.

I might be willing to call $10 or so.