My ongoing theory is that there are actually only four racquets being used by pros on the ATP tour: 1.) Wilson 6.1 Classic, 2.) Prince Original Graphite,3.) Head Prestige Classic, and 4.) Wilson PS 6.0 95. They just use various paintjobs too make their racquets look different and look like the latest models from their sponsor manufacturers. Of course, there are some exceptions like the Babolat Pure Drive and most Yonex models. Roddick uses a real Pure Drive because there's no other racquet that would enable him to serve at 150mph, and Hewitt uses a real Yonex because you can't cover up a unique head shape with a paintjob.
"You CANNOT be serious!!"