9 SNG $5 + .50 End 6th 45 Hands

OK play until last hand. I had pocket 10's (10c 10d) on the BTN, blinds 50/100, 1510 chips. UTG & HJ fold, CO limps in for 100, I raise to 400, SB & BB fold, CO re-raises me to 800. At this point I'm thinking he may be just seeing what my bet was and trying to knock me off it. I re-raise all-in and he calls. I wanted him to fold and wondered further what he might have, AA-JJ?, two big cards?. Well he shows pocket A's (As Ac). I did not give him credit for having that kind of a hand. Board holds up for him and I'm outta there!