Ambush Master

This is very high demage build...You Sap your target first,use Shadowstep and instantly use ambush,it will crit,then activate shadowdance and use ambush again..if your enemy doesn't drop dead you have 2 options...if he has low hp left use kidney shot and finish him with backstab,and if he has like 50% hp left use vanish and do fist steps again...You will win for sure :)
Use critical strike gear,sockets and trinkets...