Objective: Orienteering is an extreme sport which require different physical and cognitive properties from other sports. We aimed to predict whether the athletes will be successful or not in the competitions by pre-season performance tests. Material and Methods: Total 45 athletes who are in the same orienteering club were included in the study. Demographic data, balance, coordination and strength parameters were assessed before season. Tanita Body Composition Analyzer, Holtain skinfold, vernier caliper, Vmax Encore Viasys Program, Balance System SD and Biodex System 4 Pro were used. According to the individual ranking list created as the result of the same year's competitions, athletes were divided into two groups: Successful and Unsuccessful. Groups were compared as to measurement results. Kolmogorov Smirnov, Mann-Whitney U, Pearson's chi-square, Wilcoxon Signed-Rank tests and ROC curve analysis (area under the curve) were used for statistical analyses. Results: Left OSI (overall stability index), right OSI, left API (anterior posterior index) and right API were statistically significant differences (p=0.032, p=0.013, p=0.045, p=0.009, respectively). ROC curve analysis of measurements: The first value is right API 0.749 (95% confidence interval in 0.582-0.915), the second right OSI 0.737 (95% confidence interval in 0.573-0.901), the third left OSI 0.712 (95% confidence interval in 0.535-0.888) and the fourth left API 0.694 (95% confidence interval in 0.517-0.871) in total statistics. Left OSI 0.908 (95% confidence interval in 0.729-1.000) in males and 0.540 (95% confidence interval in 0.275-0.805) in females. Conclusions: For determining the competition success of an orienteering athlete; balance tests may be the best choice.