50NL AK in 3bet pot?

[Womble]

I have trouble playing in 3bet pots, the guy here is 16/9 over about 50 hands - hasnt done anything noticeable

Party Poker - No Limit Hold'em Cash Game - $0.25/$0.50 Blinds - 5 Players - (LegoPoker HH Converter)

SB: $62.90
<font color="black">Hero (BB): $50.00</font>
UTG: $70.87
CO: $103.80
BTN: $63.40

<font color="black">Preflop:</font> Hero is dealt A[img]/images/graemlins/diamond.gif[/img] K[img]/images/graemlins/heart.gif[/img] (5 Players)
2 folds, <font color="red">BTN raises to $2.00</font>, SB folds, <font color="red">Hero raises to $7.25</font>, BTN calls $5.25

<font color="black">Flop:</font> ($14.75) 6[img]/images/graemlins/spade.gif[/img] Q[img]/images/graemlins/spade.gif[/img] T[img]/images/graemlins/club.gif[/img] (2 Players)
<font color="red">Hero bets $10.00</font>, BTN calls $10.00

<font color="black">Turn:</font> ($34.75) 6[img]/images/graemlins/club.gif[/img] (2 Players)
Hero checks, <font color="red">BTN bets $21.75</font>, Hero folds

Pot Size: $56.50