Hero is brand new to the table and has never seen villain before. Game is 2/2 with a max buy in of $150, which hero has in front of him. Villain covers. Input on all streets is welcome, of course, but my main focus is the river decision.

OTTH:

Unknown UTG player raises to $5
UTG +1 villain calls.
Hero calls on button with TT (suits are irrelevant to how the hand plays out)
Both blinds call.

I don't 3 bet UTG raises (even small ones) from unknown players when I have TT. I'd rather take a flop multiway in position and see what develops.

Pot is $20 after rake.
Flop: 962
All check to hero, who bets $15.
Only villain calls. I range him on a flush draw, some one pair hands, a set, or a straight draw.

Turn: 5
Villain checks, hero bets $30 into the $50 pot. Villain calls. I think that the passive villain line makes a set or turned straight less likely, although of course I can't be sure.

River: Q
Villain tanks for quite a while and then bets $45 into the $110 pot.

I am getting over 3:1 on a call and wonder if I should bluff catch or fold. It's quite unlikely I beat any hand that bets for value here.

Nh. Now call river and lose to 99/78/Qhxh somewhere between 60-80% of the time, ldo.

I think it's an easy river call. I think this is 9x more than enough times to justify a call. It's an odd bet for a bluff and his line would be pretty funky for a value hand. I guess QXhh is really the only hand I reasonably expect to be behind here.

What is the standard preflop raise in that game? If $5 is way below it, then 3-bet preflop. You do want to build some sort of a pot with a strong hand like TT.

Call river. I think you can be good 1/4 of the time, even though more often than not you will be beat. Heck, villain might even be betting K9 or A9 for value.

Fold.

This is never 9x. How often do low stakes unknowns turn second pair into a bluff?. I think 9x check/calls you for 3 streets.

I also don't think this is a missed flush draw. You bet flop into 5 people. Even a bad player will know that you usually don't have Ace high or KQo.

This bet looks like he wants to get a call. Wouldn't be surprised if you get shown some weird two pair or maybe Qxhh.

looks more like a blocking bet to me, sure he will have QhXh sometimes, w/e