Hey guys,

I have been a profitable micro stakes grinder actively since about 6 months and have been a member of RIO for only a month. This is my first post in the forum on a spot I am really not sure about.

Things you might want to know: Villain 41/12 on 34 hands has been limping alot and never came to showdown with his hands. The 1st & only hand I have seen was a 6x open from villain in MP which was overshoved and he showed 99.

To the hand: Villain limps and I hold ATo in the HJ, knowing I am ahead of villians limping range I continued to raise to 3bb (too small?), everybody folds and villain continues to call. Flop comes 6d7c9s, villain checks and i continue small for around 1/3 pot, villain calls. the turn brings the 8d. Villain checks and I continues for roughly 45% pot, villain calls. River is the 6c. Villain tanks and decides to shove all in, I have 32k behind and there is a 36k pot in the middle.

My thoughts: Since I have only seen villain raise 99 very big and limping otherwise I assumed he would only open raise his pairs (99+?), ATo+, A9s+, KTs+, KJo+, QJs. The 8d on the turn giving me the straight was the nut card for me. In retrospect I think I could have found the fold button since, with the logic above, he would be limping pairs smaller than 99 and also alot of suited connectors like JTs, T9s, 76s, 86s. What do you guys think? Did I completely overplay the hand and this was a definite fold? I'm still a learning player and would love to hear your opinions.
Thanks in advance!