To win in a 1 on 1 situation you must always be where they won't expect you. If they already know where you are then drop back. Do your best to stay out of there sight but always know where they are. Slowy circle around behind cover and still where they can't see you then take them out from the side.
If you are playing against a n00b a deaf person or someone that is just a complete moron then wait until they comme out for a shot and fire rapidly at their cover. It doesn't necessarily have to hit them. This isnt the purpose. Continue to fiore as you run to a different piece of cover somewhere more horizantal to your oppenent's cover. If they are indeed a n00b they will have lost track of you and will only know your general direction if that. Wait until they stop firing and then you can take a shot or move into better position.
If you are playing against a n00b a deaf person or someone that is just a complete moron then wait until they comme out for a shot and fire rapidly at their cover. It doesn't necessarily have to hit them. This isnt the purpose. Continue to fiore as you run to a different piece of cover somewhere more horizantal to your oppenent's cover. If they are indeed a n00b they will have lost track of you and will only know your general direction if that. Wait until they stop firing and then you can take a shot or move into better position.