The purpose of this study was to clarify the importance of time duration of ground strokes. We analysed ladies` singles matches held in 2005 and 2006 U. S. Open. The rallies finished on ground strokes were analysed in this study. Total numbers of rallies in this study were 567. Time duration of ground strokes in each rally were plotted as line graphs (Figure 1). The X-axis showed the numbers of shots in rallies and the Y-axis showed time duration of ground strokes in each shot. It was found that time duration of ground strokes showed longer or shorter than one shot before. Time duration of ground strokes showed shorter in the server because the rally was started by serve and the server usually controlled the rally (Takahashi et al., 2008). It was also found that the lines in graph showed up and down regularly or irregularly. The numbers of regular pattern was 243 rallies and irregular pattern was 324 rallies. We also analysed the relationships between the patterns of graphs and the actual rallies. It was found that the strokes in short time duration were evaluated as aggressive shots and the strokes in long time duration were evaluated as defensive shots. It was also found that the rallies shown as irregular pattern had the situation of changing control between the players. Those results suggested that we could evaluate which players controlled the rally by analyzing the time duration of ground strokes.
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