[primate]

bugger off. I don't think its comparible with a CO raise either, its still EP. preflop your equity with A3s against 4 random hands is 24.8%. Add in your position and this is clearly a -EV play with huge variance.

aislephive show me your Ace rag stats EP. If they're green I'll get my coat.

If we must play this on the flop then raise and commit to the hand. Your only a serious dog to a set. Your raising UTG with this hand for exactly this scenario right?
That turn card is a bonus and sickener for the villain. It was one of your outs that you should have raised with on the flop.
You raised UTG so represent an UTG holding.