sen en iyisini hak ediyorsun

My try 

 You are the best you deserve?

You deserve the best.

why does it say ´iyisini´ not just ´iyisi´  ?

en iyi: best (as an adjective)

 en iyisi: the best  (a noun) 

It is like "the best of everything"  "the best one of all the choices"

-i hak etmek: to deserve

putting them together means en iyisi becomes

en iyi-si-ni hak etmek

 Thanks Marion-I saw the ´sin´ ending and thought ´you are´ like-´you are the best´

I knew the other translation made more sense but thanks for explaining.