He just lost to Fish 1 and 2 in Kooyong
Yeah, in a exhibition match that he clearly didn't try in with the strong wind completely affecting his serve. Why anybody here would cite that as evidence of some kind of weakness, I'm not sure.
Nobody expects him to win a GS this year, but if he serves like he did last week, it's going to be very hard for even the best players in the world to knock him out. Making it to the 4th round or the quarters would be a great result for him.