The purpose of this study was to develop a bio-kinematic model for the optimal ready position in tennis by identifying five bio-kinematic variables of the lower limb joints. Additionally, this research aimed to quantify the contribution of these variables to the response time of tennis players. The descriptive method was used in this study based on bio-kinematic analysis as it suits the nature of the study. The study sample consisted of two players who were intentionally selected from high-level tennis players. The study was conducted using video recording with the Kinovea program for five different stance per player in six directions, with a total of sixty attempts for the ready positions. The main findings were: 1- the response time was significantly affected when changing the technique of the ready position, the effectiveness of the ready position significantly impacts the efficiency of the movement, reaching the ball, and performing the stroke well which increases the players` success rate. 2-the angle between thighs is the most contributing bio-kinematic variable in the performance of the ready position, with contribution rate of 88.33%. When the angle between thighs is within range of 70° to 80° the optimal ready position is achieved.
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