Yonex EZONE XI 98 : The Yonex EZONE XI 98 is the heaviest racquet in the EZONE XI family. It provides a stable base for the aggressive all court player, and an open string pattern creates a responsive, spin-friendly feel. As used by Ana Ivanovic & Zheng Jie.Yonex believes that as the game of tennis evolves, so should the equipment. The EZONE XI series of racquets leverage the latest and greatest cutting edge technologies to help you take your game to the next level. EZONE XI racquets feature Extra Isometric technology that expands the sweetspot, reduces vibration, and enhances power.