4 hands and Out

I played my usual Thursday night live tournament. We had just under 60 players. Four hands in I get dealt A10h on the button. With 3 limpers to me and blinds at 100/200 I raised it to 600. Small and big blind folded. Got two callers from the original 3 limpers.. Flop comes 10,9,2. Guy bets out 1700. The other limper folded. Action on me. I am sitting there looking at high pair and high kicker. That's a huge bet. I looked at all possibilities. Did he have pocket pair and match the board?? Possible but not likely. Did he have an over pair like Jacks or Queens. He would have raised preflop. Did he have like KQ and figure he was good? So what did he have?? I though maybe K,10 or A,10 or maybe A9. I thought a long time and looking at my chip stack as we start with 5000 chips and realized that I was already down to 4000 with my preflop raise and having just paid small and big blind. Just calling only left me with 2300 in chips and I thought I was at least good. I pushed all in. He called. He had 10, 9 off suit. Yep. He hit two pair on the flop. I was floored. The turn and river gave me no help and I was out. There was no way that I put him on that hand... Isn't poker fun???