4 RDS001 frames, used by Nalbandian and Hewitt back in the day. great rackets but I can't seem to get enough power with them... These babies are strung with Cyclone, Kirschbaum Pro Line, Hurricane Feel/Volkl V-Pro and Poly Tour Pro. I like these frames at around 52-55 lbs since it is a control frame. Any tighter and I get zero pop on the ball! One of the frames is the re-release with a new paint job but I can't really tell any other differences..... 2 Head Extreme Pro frames. Much more power than the yonex frames. I am keen to playtest the 2.0 versions that Youzhny uses, wonder if they are much different. If you're wondering, I decided to mix up my head stencil and give it the mirror effect ;-) I quite like it! These babies are strung with Head RIP Control and Hexablade/Solinco ProStacked. Both at 58lbs. the frames are exactly the same but one is microgel and one is youtek. Still don't know which I prefer, they both feel great!