two hands vs super lag

[LAgambol]

First hand: 10/20 NL
Hero has 3200, Villain covers
Villain is playing super lag but tough player, i called a big river bet earlier in the session and he just mucked. Big calling range from the blinds.
Hero has K9 [img]/images/graemlins/club.gif[/img]
Villain is UTG and straddles to 40, all fold to hero in SB who makes it 180, BB folds, Villain calls
Flop: 83 [img]/images/graemlins/diamond.gif[/img] 4[img]/images/graemlins/diamond.gif[/img]
Hero bets 300, Villain calls
Turn: 9
Hero checks villain checks
River: 2
Hero bets 400, Villain raises to 1400
Hand two
Hero has 3300 Villain covers
About two hours later, Villain has been running hot and has been the big winner so far
10/20/40 straddle
Hero has 66 and makes it 200 from CO, Villain in SB calls, all fold
Flop: 8 [img]/images/graemlins/diamond.gif[/img]5 2
Villain checks, Hero bets 300, Villain calls
Before the turn comes, Villain bets 400 blind
Turn: 10 [img]/images/graemlins/diamond.gif[/img]
Hero calls
River: 3 [img]/images/graemlins/diamond.gif[/img]
Villain bets 900, Hero?

Thoughts on all streets appreciated