100 NL tough call or easy fold?

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PokerStars No-Limit Hold'em, $1.00 BB (5 handed) converter

MP ($64.40) <font color="red"> 47/7 after 60 hands</font>
Button ($75.60) <font color="red"> 36/3 calling station</font>
Hero ($96.55)
BB ($54.20)
UTG ($123.80)

Preflop: Hero is SB with 3[img]/images/graemlins/diamond.gif[/img], 7[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">1 fold</font>, MP calls $1, Button calls $1, Hero completes, BB checks.

Flop: ($4) 3[img]/images/graemlins/club.gif[/img], 3[img]/images/graemlins/heart.gif[/img], 5[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(4 players)</font>
Hero checks, BB checks, MP checks, <font color="#CC3333">Button bets $3</font>, <font color="#CC3333">Hero raises to $6</font>, BB calls $6, MP calls $6, Button calls $3.

Turn: ($28) 9[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(4 players)</font>
Hero checks, <font color="#CC3333">BB bets $10</font>, <font color="#CC3333">MP raises to $57.4</font>, Button folds, Hero ??? </font>


While playing the 25-1K contest as I don't have the BR or the skills yet to play here regularly.

I was *very* surprised that my flop c/r didn't thin the field a little.

Hand ranges (?) - someones got the other 3 and my kicker is no good - but this pot is huge. MP either has turned a set of 9's or is raising with air. 50/50 either way. BB is likely calling all-in behind me - calling station that he is tho I think he has A3 K3 or any three that beats me.

Anyone call this??