Strength is important factor impacting performance. Speed manifests not only by court movement,but also in reaction speed and in speed of individual shots. The aim of the paper is to analyze the levelof basic anthropometric (body height, H; body weight, W) and speed characteristics of young Czechtennis players, to assess inter-gender differences and to determine the correlation between individualvariables. The research sample consists of Czech junior male tennis players (n = 221) and female players(n = 217) between the ages of 13 and 14 years. Research data was acquired using test battery TENDIAG1between years 2000 and 2015. Based on the data following basic static characteristics were calculated;for male players n = 212, H = 170.30 ± 8.96 cm, W = 57.20 ± 9.25 kg, AT = 13.56 ± 0.69 s) and forfemale players (n = 217, H = 168.70 ± 12,22 cm, w = 55.85 ± 11.10 kg, AT = 14.05 ± 1.18 s). Substantivesignificance of differences between male and female tennis players was assessed using Cohen’s d. Nosignificance dependence was measured in anthropometric levels between male and female players (H,d = 0.14; W, d = 0.13), medium significance dependence was found in run speed test (d = 0.50) in favor ofmale players. Medium significance dependence between running speed and body height and weightrespectively (r = 0.45, resp. r = 0.43) was demonstrated at male players, small significance betweenrunning speed and body height and weight respectively (r = 0.24, resp. r = 0.16) at female players. Forpurposes of training, co-educated training units can be considered.