Thats because he had very easy draw until now.
No one of players he beat until today was ever able to take anything from him ever before.
Federer is ruthlessly pinisshing them.. im sure murray/ djoker would have struggled and lost atleast a set when they faced tomic or raonic !!
If stan faced fed... he would have destroyed him i8n 3 sets.. will u say fed has an easy draw then ??
wake up mann.. hez going to destroy tsonga also in 3 sets.. and ull come up once agin with "there shows u ... fed with an easy draw