This cross-sectional study investigated the comprehensive physical fitness and motor ability for Japanese elite age-group tennis players. Sixty one male players were divided into three age groups : group A (12-14 yr), group B (15-17 yr), group C (18- yr). It was found that : 1) There was a significant correlation between total Principal Component Analysis score (all PCAS) which summed up laboratory and field test results and match performance based on the Japan Tennis Association ranking points per 1 tournament（ JTA RP/1tournament). 2) Several variables such as jump ability and medicine-ball throw did not show differences significantly from groups B to C, but only isokinetic strength in leg and trunk showed differences significantly across the three age groups. 3) A significant regression between the laboratory test and field test scores was found (y＝0.863x-0.108, r＝0.802, p<0.01). Based on this regression, some players were judged to poor motor ability for their physical fitness. These results suggest that well-balanced training between physical fitness and motor ability was essential to progress tennis performance.
