$50NL - TT facing weird river overbet

[zacd]

villain is 15/7.5/3

i probably call:reraise this hand preflop 50/50 but in this case not reraising has gotten me into a tough river decision.

was thinking of bet/folding turn but was hoping to see a showdown for maybe 2/3 pot or so on the river but he made that odd bet.

Full Tilt Poker
$0.25/$0.50 No Limit Hold'em Ring Game
5 Players
LegoPoker Hand Converter

<font color="black">Stack Sizes</font>
BTN: $78.15
SB: $140
BB: $37.6
UTG: $50
Hero (CO): $50

<font color="black">Preflop:</font> T[img]/images/graemlins/diamond.gif[/img] T[img]/images/graemlins/club.gif[/img] ($0.75, 5 players)
<font color="red">UTG raises to $1.75</font>, Hero calls $1.75, BTN folds, SB folds, BB folds

<font color="black">Flop:</font> 5[img]/images/graemlins/club.gif[/img] 7[img]/images/graemlins/diamond.gif[/img] 3[img]/images/graemlins/heart.gif[/img] ($4.25, 2 players)
<font color="red">UTG bets $2.85</font>, <font color="red">Hero raises to $9</font>, UTG calls $6.15

<font color="black">Turn:</font> 5[img]/images/graemlins/club.gif[/img] 7[img]/images/graemlins/diamond.gif[/img] 3[img]/images/graemlins/heart.gif[/img] [3[img]/images/graemlins/diamond.gif[/img]] ($22.25, 2 players)
UTG checks, Hero checks

<font color="black">River:</font> 5[img]/images/graemlins/club.gif[/img] 7[img]/images/graemlins/diamond.gif[/img] 3[img]/images/graemlins/heart.gif[/img] 3[img]/images/graemlins/diamond.gif[/img] [3[img]/images/graemlins/spade.gif[/img]] ($22.25, 2 players)
<font color="red">UTG bets $25</font>, Hero folds
Uncalled bet of $25 returned to UTG