Originally Posted by KoreanHB
From what I see. Fed did change his racquet to a smaller head. If you look at pictures of his ncode PJ and Kfactor PJ, there is a big difference, clearly.
Are you sure you're not just imagining things? His K90 still sure looks like a 90 sq. in. to me, just like his nCode 90 did. I think that's because its the same racquet under the paintjob.