Hit the little one on the jaw. Seriously, if i was a smaller guy, i'd take away their jab by standing out of range with my gaurd down trying to intice them to throw more than one shot. To get inside, i'd throw a jab about a foot wide of their head, move inside and go to the body. One or two quick combos then dart back out so they cant lean on you with their weight. If i had the power to get their attention, I'd start fainting with the left to the body and move upstairs as the fight progressed with the right. I'd always aim my shorter left jab about a foot wide of the right side of their face, forcing them to turn into my straight right/right hook which would follow it.
Circle around before getting inside. Start with in and out movement, moving clockwise and varying the pace. You want to get warmed up before you go in with a full fisted attack. If you go down, you will need to increase your head movement. Tighten up by using a donkey punch.
Milling is the way to go. It would be the best way to get yourself knocked out, but it has to be a better bet than some of the utter **** we've been seeing for the past few years.