NL 20 SH A9o TopTwo Whats my line?

[Ghostmaster]

Titan No-Limit Hold'em, $0.10/$0.20BB (Titan HH Converter by Kreatief)

MP3 ($16.25)
CO ($10.00)
Button ($29.53)
SB ($20.00)
BB ($21.39) (Hero)
MP2 ($37.15)

Preflop: Hero is BB with 9[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/club.gif[/img]
<font color="#666666">1 folds</font>, MP3 calls $0.20, CO checks, <font color="#666666">2 folds</font>, Hero checks,

Flop: 9[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/heart.gif[/img], 8[img]/images/graemlins/heart.gif[/img] ( $0.7 )
<font color="#CC3333">Hero bets $0.60</font>, CO calls $0.60,

Turn: 2[img]/images/graemlins/diamond.gif[/img] ( $1.9 )
<font color="#CC3333">Hero bets $1.40</font>, CO calls $1.40,

River: 2[img]/images/graemlins/spade.gif[/img] ( $4.7 )
Hero checks, <font color="#CC3333">CO bets $3.00</font>, Hero calls $3.00,

Final Pot: $10.17

River selber betten? Ich war mir hier irgendwie ziemlich unsicher was zu tun ist.