Poker Stars $0.10/$0.25 No Limit Hold'em - 9 players
The Official 2+2 Hand Converter Powered By DeucesCracked.com

MP1: $24.00
MP2: $4.65
CO: $9.50
BTN: $10.20
SB: $17.75
BB: $34.60
UTG: $24.15
Hero (UTG+1): $25.85
UTG+2: $3.60

Pre Flop: Hero is UTG+1 with 9 9
1 fold, Hero raises to $1, 1 fold, MP1 raises to $3, 2 folds, BTN calls $3, 2 folds, Hero calls $2

Flop: ($9.35) 8 6 7 (3 players)
Hero checks, MP1 bets $3.50, BTN raises to $7.20 all in

i think pf is marginal (at least i did when i called)
how do i proceed?

Any reads?

Interesting spot. Preflop play isn't bad. You have to realize that you're probably setmining at this point, and possibly floating HU against PF raiser if PFRer bets small and button folds. That's most likely what BTN is doing (after his postflop aggression).

Methinks that BTN could have any pocket pair 66-QQ, and MP1 could be simply CBetting. AK,1010+ standard here. A shove here is only going to get called by 1010+, AK will fold out and you'll be HU against someone already all-in for a side pot. A call is stupid because you'll just be priming MP1 for a shove with 1010+ and you'll have a tougher call then. I feel as though a fold is laying out of a potentially big big pot. There is 21 dollars in the pot, and you have 10 outs to make by the riv. There is also a good chance that you straighten up and one of them boats taking out either pot.

I don't think semi-bluff shoving has any merit against a small stack and 100BB stack, seeing as you have damn near 0 FE against either player (I think it's unlikely for most NL25 opps to have 3BPF with any hands that 99 beats given his position, and you can't bluff someone who is already AI). You clearly cant' call out of the threat that MP1 will shove behind. I think you have to fold.

i didn't have stats iirc

3.5 bet is coincidentally the maxbet that will still be reraised if the SS pushes.

I like fold>push>>>call
w/o reads it's hard to say
knowing his 3bet range & tendancy to stack off w/ overpair in this spot are key imo.
If he's W/T enough to fold here, I'll push.
If I push, I still have to beat the BTN, who likely has TT+ w/o reads.

You are looking at an MP1 overpair 90% of the time here,
so I lean towards folding if mainly because FE seems minimal.

Foldaments unless you want to gamble

If MP1 is good enough to fold an overpair when you shove then I think that a shove is the correct play. If not, I would fold.