well if the guy is taller than u and u dont got much ma expeiense and ur jsut hte old school wing it street fighter. i suggest u stay out of the regualar spot of infront of him where he would usually amim, but when he tryes to hit u stay low and duck. then when his guard is down upper cut the hell out of his jaw, get ur heel jab it on the top of his foot punch him in the gut and once again grab his shirt colalr by the neck and just keep punching him till he is out in the sweet spots aka nose cheek bone jaw line chin ect ect.