in HU if u have jack 7 suited or better u are probably ahead preflop
so be agressive, very very lag style
I think the hand is Q7, the average hand. But agreed, you need to play aggressive. Just remember, ~50% of the time you have the better hand. K2o is most likely a better hand than your opponent has. I'd read Harrington on Hold 'em and pay extra attention to his discussion on M and aggression. If each of you has around 10-15 big blinds left it'll be just a crapshoot. If everyone busted early and you have a few more chips to play with, you can make a few moves and wait for a good spot to put a lot of your money in the pot.
I played a guy recently HU at the end of a SNG, we were exactly even in chips as the HU portion started (it was a 10-person sng, so each of us had 7500 chips). He was playing way too tight. I raised every single hand and he continually folded. Finally he raised, and I folded. He continued to fold to my raises until he had about 2 big blinds left. He'd push, and he won about 5 hands where we were either coin flips or 60/40 one way or the other, until he finally lost one of them. Moral of the story, go in before you get that low. Get fold
equity too. If you push, they have to have a decent hand to call. 27o, the worst hand in poker, against a random hand is only a 65/35 dog. That
tells you something. Even if they called you every time, you'd only lose 65% of the time. Especially if you have the chip lead, put your opponent to the test of an all-in often. Even if he knows you could have any 2 cards, is he going to make a call with J5o?