The current research aims to evaluate and compare the performance of five racquets used in tennis through identifying bio-kinematic variables resulting from using nanotechnology in manufacturing tennis racquets and the best Nano-enhanced racquets approved by ITF. The researcher used the experimental approach with video recording and computer-based motion analysis. The researcher purposefully chose five types of Nano-enhanced tennis racquets approved by the ITF and from different countries and manufacturers according the annual report of ITF 2014. Computer-based bio-mechanical analysis was performed using XP Digital Motion Software (final version April 2014). Results indicated that: Kinematic variables under investigation affect ball rebound velocity greatly. Values of vertical velocity SY, horizontal velocity SX and sum velocity VR vary according to using different types of Nano-enhanced racquets. Analytical and comparative studies for Nano-enhanced racquets helped showing the differences among various types of racquets.
As for ranking racquets, type two (Wilson) came first in frame flexibility and light weight in addition to inertia and more balance. Type one (Babolat) came second, type four (Prince) came third, type three (Head) came fourth and type five (Yonex) came fifth. There is a disproportionate relation as the decreased of tensile coefficient of frame flexibility causes an increase in strings cohesion and an increase in ball rebound velocity off the racquet.