Haha, well you want to bolt to their side at the start and always try be somewhere they don't expect. In their spawn.
Get chased, run into a building and leap out a window and back to catch them from behind.
Use stuns, flashes on groups.
Slide and climb and dart about a lot.
You have to close the distance so you can maximise your short range.
Stay away from big open spaces and headglitches etc.