Yeah i see what you mean after comparing the pictures i have with my k90. Indeed it is not the same mold.
Like I said, i only heard a few tidbits of the conversation, also mentioning the 90sqin head. What i think he was implying was that his racket is more or less fundamentally what federer plays with. After spending alot of time with him traveling this past year, i think he'd know. The 85 was "the sampras", the 90 is "the fed", at least in his mind.
mind you this was a prewarmup chit chat with Arias. sampras probly just wanted to get to the baseline
