I posted this photo on another thread too - but it kinda fits here as well.
You guys do know that he's actually not using a real 90sq in frame. It's actually a paintjob of a much smaller headsized frame - and that's why he loses all these matches. Here is proof positive - it's a photo of Federer's own racquet provided to me by the paint technician at Wilson before the paintjob - and after. So if he actually switched to the real BLX 90 he'd for sure win every slam for the next 5 years.