I don't know how well this really works, but it has been very effective for me: I simply establish the beginning of any sparring match by going in and charging the person, usually with a punch to the head (nothing hard, just enough contact to score) This usually works for me and then the rest of the match is won by a few kicks and a few combos, but I usually charge a couple more times. If nothing else, the person backs out of bounds. I don't know why this works, if someone rushes me, I sidekick them or move out of the way and counter. But, it has worked since I fought anybody from orange all the way up to black belt.