Abstract
This study deals with the performance development analysis of players, in the conditions of the Czech Tennis Association enviroment (before 1993 of the Czechoslovak Tennis Association), and the aim is to find if the competitive success of Czech, or Czechoslovak players reached in the U12 and U14 age categories relates to their later top performance achievements at the international level. The results, based on the quantitative and qalitative methods, show that, for being among top 100 players of ATP and WTA Tour, it is important to have the ranking among top players already in the U12 and U14 age categories, but in fact the order of ranking does not have to play the crucial role.
There is an influence of the previous training, the role of specialization or talent as well.