100nl- TPGK facing river check-raise

[traz]

Villain is 38/18/2 over 75 hands

Party Poker - No Limit Hold'em Cash Game - $0.50/$1 Blinds -
5 Players - (LegoPoker Hand History Converter)

SB: $264.69
Hero (BB): $153.21
UTG: $101.98
CO: $98.50
BTN: $159.86

Preflop: Hero is dealt A[img]/images/graemlins/diamond.gif[/img] Q[img]/images/graemlins/diamond.gif[/img] (5 Players)
3 folds, SB calls $0.50, <font color="red">Hero raises to $4.00</font>, SB calls $3.00

Flop: ($8) 9[img]/images/graemlins/diamond.gif[/img] 8[img]/images/graemlins/spade.gif[/img] A[img]/images/graemlins/spade.gif[/img] (2 Players)
SB checks, <font color="red">Hero bets $7.00</font>, SB calls $7.00

Turn: ($22) 7[img]/images/graemlins/heart.gif[/img] (2 Players)
SB checks, Hero checks

River: ($22) 2[img]/images/graemlins/club.gif[/img] (2 Players)
SB checks, <font color="red">Hero bets $17.00</font>, <font color="red">SB raises to $42.00</font>, Hero says wtf?