Top Pair, too passive?

[mscags]

No reads on villians as they are both new. Is this too passive? Just right? What do you do different? I thought about 3 betting the flop but decided that the villian that capped it probably had a pocket pair since he capped preflop and figured I wanted him in, plus I didn't want to get capped and then have to make a fold on the river, as the pot was shaping up to be significant.

Party Poker 10/20 Hold'em (6 max, 5 handed) FTR converter on zerodivide.cx

Preflop: Hero is SB with A[img]/images/graemlins/diamond.gif[/img], 9[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">2 folds</font>, <font color="#CC3333">Button raises</font>, <font color="#CC3333">Hero 3-bets</font>, <font color="#CC3333">BB caps</font>, Button calls, Hero calls.

Flop: (12 SB) A[img]/images/graemlins/heart.gif[/img], Q[img]/images/graemlins/club.gif[/img], 5[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, <font color="#CC3333">BB bets</font>, <font color="#CC3333">Button raises</font>, Hero calls, BB calls.

Turn: (9 BB) 8[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, BB checks, <font color="#CC3333">Button bets</font>, Hero calls, BB folds.

River: (11 BB) 7[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">Button bets</font>, Hero calls.

Final Pot: 13 BB