The purpose of this study was to analyze if relation between taking the first ball possession and the partial and final score in male and female waterpolo existed. The 192 matches disputed by participant teams in the 2003 and 2005 Water Polo World Championship were recorded. The sample was 768 actions of beginning of every game period. The observational methodology was applied. One observer was trained until he reached intra-observer reliability values higher than 98%. We used the Chi-Square test and the association test by means of statistical Gamma. To take the first ball in a greater number of periods is related to a favourable partial score in both categories and with a favourable final score in female category.
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