With the SAGIT/TENNIS system, we gathered tennis game data on the effectiveness of the serve, return of the serve and the base line game of seven male professional, eleven male and ten female junior tennis players. The purpose of the study was to find out whether there are any differences between groups of players in regards to the outcome and effectiveness of strokes in different game situations. A one-way ANOVA and the Tukey post-hoc test was employed to assign specific differences between the groups. On average, matches lasted for one hour; duration of the rallies was on average 4.4 to 7.3 seconds; and in each rally, there were 3 to 5.3 shots performed. The percentage of the active part of the game lasted from 18 % to 27.6 %, with more than half of the points ending before 5 seconds. Professional tennis players achieved a higher number of aces with their first serve. Female junior (6 %) and professional tennis players (7.6 %) had a significantly higher percentage of successful second serves and were more successful in executing returns on the second serve. Professional tennis players played much more offensively on the base line, which was evident from their significantly lower percentage of successful shots; in addition, they used the backhand slice more frequently to change the rhythm of the game. The applied system enables the identification of game patterns and situations, and thus more targeted planning in training.
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