This build have awesome movement speed, AD, also good hp and lifesteal. Really.. I don't know better. :D So.. If you want to be good with yi.. Use this build. :D You can kill everything when you got last item! :) You come legendary with easy :D

Pros

-fast
-good AD
-good lifesteal

Cons

-not so much hp

I think u need max Alpha strike first because its good for chasing. And dont level up ur meditate at early game. U dont REALLY need it! Wuju style is good to max for ur AD.. You dont have good AD without Wuju style and Infinity edge.

When u go attack put your Wuju style and Highlander on. If enemy is far use Alpha strike to chase it. Then u get kill. :) U can also use higlander to escape... But i dont like use it to escape..

I choose Attack speed and AD runes because Yi need it.. AD runes is good at start (:

Start with Boots of speed because you need movement speed at start.. It's big help for you..

Choose flash and exhaust...

Flash

-good escape and chasing ability
-can go trought walls

Exhaust

-Choose this because u need it at early game
-slow enemy champion much

24/0/0

Offense

-U need offense much..
-U got much AD from here..
-I think I dont need to say more from offense masteries..

Utility

-Good hands is big help because at 3/3 u got 10% more time in death..