Bad play on this hand?

[hummusx]

I was really surprised when I was going through some tournament histories and saw this fold. Of course, from a results perspective it was just a massively good read on my part. In all seriousness though, I think my though was that in an unraised pot, I could be facing just about anything here. What do you think should I have folded on the flop?

Party Poker No-Limit Hold'em Tourney, Big Blind is t15 (10 handed) converter

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

UTG+1 (t980)
UTG+2 (t685)
<font color="#C00000">MP1 (t690)</font>
MP2 (t695)
MP3 (t555)
CO (t535)
Button (t710)
SB (t1550)
Hero (t800)
<font color="#C00000">UTG (t800)</font>

Preflop: Hero is BB with 9[img]/images/graemlins/diamond.gif[/img], 5[img]/images/graemlins/diamond.gif[/img].
UTG calls t15, <font color="#666666">2 folds</font>, MP1 calls t15, <font color="#666666">4 folds</font>, SB completes, Hero checks.

Flop: (t60) 7[img]/images/graemlins/spade.gif[/img], 2[img]/images/graemlins/spade.gif[/img], 5[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(4 players)</font>
SB checks, Hero checks, <font color="#CC3333">UTG bets t55</font>, MP1 calls t55, SB folds, Hero folds.

Turn: (t170) 3[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
UTG checks, MP1 checks.

River: (t170) A[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
UTG checks, <font color="#CC3333">MP1 bets t150</font>, UTG calls t150.

Final Pot: t470

Results in white below: <font color="#FFFFFF">
UTG has 7h 7c (three of a kind, sevens).
MP1 has Kc 2c (one pair, twos).
Outcome: UTG wins t470. </font>