The aim of this research is to define crawl swimming velocity realized by junior water polo players during a match. Over a four year period, 35 water polo players have been observed at the age of 16 years. It was established that there is no statistically significant difference of crawl technique swimming velocity between the quarters of a match (F=1.903, p =0.127). It was also determined that there are no differences of swimming velocity distribution with regard to quarters (F=5.269, p = 0.153). The given fact can be a consequence of adaptation to the applied training load of dominantly aerobic type, but also to the tactical choices during play. The obtained results should not be generalized and it does not mean that the same results would be obtained if this category were to be observed on the international level.
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