I thought of another tip while spectating a game.
A lot of people are not dodging enough.  The reason we dodge is to not only move quicker, but to be much more aware of what is going on around us.  

Say you are moving down a hallway, and there are openings on your right but the wall is solid to your left.  While moving forward, look right and dodge left.  While in the air look behind you and then back ahead again while using the aw keys to maintain your forward momentum.  By doing this in a 1v1 it makes it very difficult for anything to get by you.  If some one comes in view of you for even a second, you will spot them and be able to act accordingly.  Keep in mind you don't have too look all the way backwards, just so that the right hand side of your screen shows directly behind you you should be okay.