TPTK drawy board - fairly common spot

[Profish2285]

Villain is completely unknown, just sat down. What does everyone do here and why?

Full Tilt No-Limit Hold'em, $0.50 BB (6 handed) Full Tilt Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

saw flop|<font color="#C00000">saw showdown</font>

BB ($26.60)
<font color="#C00000">Hero ($61.25)</font>
<font color="#C00000">MP ($49.25)</font>
CO ($7)
Button ($87.45)
SB ($70.30)

Preflop: Hero is UTG with A[img]/images/graemlins/heart.gif[/img], K[img]/images/graemlins/club.gif[/img].
<font color="#CC3333">Hero raises to $1.75</font>, MP calls $1.75, <font color="#666666">2 folds</font>, SB calls $1.50, <font color="#666666">1 fold</font>.

Flop: ($5.75) 9[img]/images/graemlins/diamond.gif[/img], Q[img]/images/graemlins/heart.gif[/img], K[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">Hero bets $4.5</font>, <font color="#CC3333">MP raises to $9</font>, SB folds, Hero....