The purpose of this article is to present the results of a survey of the strength, character, and direction of the links between: (1) indicators determining mental performance and (2) indicators of tactical actions in defence of students playing basketball. This survey is conducted in 2016 with 30 male students playing basketball at the Sports Club at the University of Economics Varna. Tests are carried out to assess effective and ineffective group tactical actions in defence. The results show some interesting dependencies among the two groups of indicators. Mental indicators moderately influence some tactical actions in defence.