I was just watching the first round again...Watch your feet and legs when you punch, how you step in with the jab, and, especially, when you jab then throw a left. See how far apart they get? There are points, when throwing a left hand, that your left knee nearly touches the ground, your right knee is bent to the point that you are practically kneeling.
You can't punch like that, no way, no how. That first step you take, with the jab, is way too long a step, and, to compound it, you don't bring your left foot with you. So you don't get much on the punch, and you are too spread out to throw a second or third punch.
Being that wide with your footwork may seem like a way to avoid punches or to get out quickly, but it is not. It makes you pull back in straight lines, giving your opponent the luxury of getting right on top of you without worry of anything coming back. Watch Joe Louis and see how economical he is with his footwork, how his feet and hands work together. Watch Orlando Canizales, too. He moves a lot more than Louis but has that same basic economy of movement, and really coordinates his feet and hands very well.