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The purpose of this study is to the winning factors in 31 games of Pro Tennis Fessional who has been listed on ATP and were participated at US open tennis 2003 singles of 32 tournaments, to research the element which effect on consequence of the game. This study uses the statistics program SPSS(Statistics package for the Social Science)WIN Korean version 10.0 for this research. Independent t-test is operated of know the concluding difference between the winning factor in performance to significant difference of .05 in the grass court tennis match competitions. Spearman's correlation analysis. Therefore, we obtained the following conclusion. Frist. there were difference of Total Point Won, Winning % on 1st Serve, Winning % on 2nd Serve, Net Approaches %, Break Pt. Conversion %. Second, as a result correlative analysis through the main variable, the player who tries to gain Groundstroke and Winning % on 1st Serve, Winning % on 2nd Serve, at Service marks high Winners.