Marginal Value Bet

[HighSteaks]

Without a PFR from this guy I found it hard to put him on anything other than a rough Ace and was concerned only holding a two myself - but I am still wondering if I should have bet this river.

PokerRoom 0.50/1 Hold'em (10 handed) internettexasholdem.com

Preflop: Hero is Button with A[img]/images/graemlins/diamond.gif[/img], 2[img]/images/graemlins/diamond.gif[/img]. MP1 posts a blind of $0.50. CO posts a blind of $0.50.
<font color="#666666">2 folds</font>, UTG+2 calls, MP1 (poster) checks, MP2 calls, <font color="#666666">1 fold</font>, CO (poster) checks, Hero calls, SB completes, BB checks.

Flop: (7 SB) T[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/club.gif[/img], 5[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(7 players)</font>
SB checks, BB checks, UTG+2 checks, MP1 checks, MP2 checks, CO checks, <font color="#CC3333">Hero bets</font>, SB folds, BB folds, UTG+2 calls, MP1 folds, MP2 calls, CO folds.

Turn: (5 BB) 4[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
UTG+2 checks, MP2 checks, <font color="#CC3333">Hero bets</font>, UTG+2 calls, MP2 folds.

River: (7 BB) 7[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
UTG+2 checks, Hero checks.

Final Pot: 7 BB