[ChrisV]

I don't play many big tournaments so maybe that "limp in and try to hit" stuff is good advice there, but in SNGs it's vastly overrated. The exception is trying to hit sets with small pairs, which is a good idea. That's because you get to straight up flop a rock solid hand with them.

Suited connectors and suchlike should only be limped in late position after other limpers. J9o I'm not going anywhere near. The right way to play a SNG is tight and passive early and loose and hyperaggressive late.

That said, in the situation you're in, you should fold. If you hit your 9 and then raise him it's going to be completely obvious what you have when you raise and only a moron is going to donate his stack with ace-random kicker. The only time you'll be getting action is when he has a better nine.

If you hit your jack, you probably still aren't going to get a lot of action. He didn't raise preflop so his ace either has a bad kicker, or worse still a jack, nine or five kicker. Once again if you get lots of action it's probably because you're beaten.

The advice doesn't change if it's the button betting (although if you're second last to act you might consider betting yourself) - nobody's losing their stack here unless it's you.