Purpose: The present study aimed to examine the mediated effect pre-competitive anxiety on the relationship between mindfulness and sport performance. Method: Cross-sectional design was conducted in the present study. The participants in this study were 221 amateur collegiate tennis players (112 male and 109 female; M _(age)= 20.92, SD _(age) = 1.97). Result: The hierarchical multiple regression with bootstrapping re-sampling revealed that pre-competitive cognitive anxiety partially mediated the relationship between mindfulness and perceived athletic performance. Furthermore, the positive relationship between mindfulness and objective athletic performance, and this relationship was partially mediated by pre-competitive somatic anxiety. Conclusion: The present study preliminarily confirms the adaptive effect of mindfulness in sport competition as well as the mediated effect of pre-competitive anxiety.