What works for me is getting in close with the body shots and usually finishing with an uppercut, cross, or both. This is usually hard to give advice on because every opponent is going to be different and the things you do won't always be effective. The only real advice that I can give is "NEVER!", "EVER!" take your eyes off of your opponent! Even while getting hit. (Remember your going to get hit or kicked regardless.) Also stick (hit, kick) and move.