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Does anyone else 3bet the turn. You have top pair and an OESFD.

Thats:
9 outs to a flush
8 outs to a straight
2 outs to trips
3 outs to an iffy 2 pair (1 actual out)

Plus if you 3 bet the UTG+1 might lay down whatever random crap he holds.

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I don't think we should be worried about UTG+1. He is certainly a weak player who does not know how to play poker or does not like his hand.

With that being said, the person to keep attention to is MP2, whom I'm pretty sure has KQ right now. You do have an OESFD, but you're drawing against the nuts on the turn. You 3-bet and he will cap. If you make a straight, you either lose with the low-end or you chop with a K. Two pair is no good. Set is no good. Assuming your two opponents hold no diamonds, your best case is nine outs. You will only make this flush 20% of the time with all nine outs.