I'm guessing it's the other players skill, your'e going to have to get better at the game. I'd try and find someone that could teach you these skills or spectate the players that are hard for you to beat to get an idea of how they play and what skills to use.
A tip to help you angle a bit better is to rasie your mouse speed. play for a bit rasing it in about increasements of 2 untill you find a mouse speed you are comfortable with that you feel you can control without problem.
Don't block unless the person is about 20 feet away from you and going perfectly straight. By doing this, you:
a) Surprise him by blocking (he was a short distance away, so it's not like it was completely obvious.
b) Hes right in front of you so he isnt going to pull off a sidehit unless hes really good. In that case, dont block. Run.
Damn right there Zeonix, I usually choose the run option, but I swoop backwards then suddenly he's folowing me, then I just tap w twice while still swooping back and BANG! We both get hurt, kinda a kamikazi in a way.