The objectives of this experimental study: (1) Differences in the effect of game and drill training methods on improving basic tennis technique skills, (2) Differences in basic tennis technique skills between the age groups 10-12 years and 13-15 years and (3) The effect of interaction between training methods and age group on the improvement of basic tennis technical skills. This research method uses experimental research with a 2x2 factorial design. The sample consisted of 24 male athletes in Lampung who were separated into 4 groups, each consisting of 6 people. Sampling was carried out by purposive random sampling, namely (1) boys aged 10-15 years (2) actively participating in club training for at least 1 year (3) the condition of the child is physically and mentally healthy (4) proper facilities and infrastructure. Tennis basic technique skills test using the ITN Assessment On Court. Two-way analysis of variance (ANOVA) was used to analyze data with a significance level of 0.05. SPSS software version 26 was used for the entire data analysis process. The results showed: (1) There are differences in the effect of game and drill training methods on improving basic tennis technical skills. The game training method provides a greater improvement effect when compared to the drill training method. This is evidenced by the acquisition of an average score for the game training method of 48.6 and the drill training method of 40.35. The 10-12 year old group has a greater increasing effect when compared to the 13-15 year old group. This is evidenced by the acquisition of an average score for the 10-12 year age group of 45.50 and the 13-15 year group of 43.45. (3) There is an interaction effect between training methods and age groups on basic tennis technical skills. This is evidenced by the average score of each cell for the game practice method with the 10-12 year old group (a1b1) of 48.8, the game practice method with the 13-15 year age group (a1b2) of 48.40, the game method drill training with the age group of 10-12 years (a2b1) of 42.4, and drill training methods with the age group of 13-15 years (a2b2) of 38.5. Thus the game training method has a greater influence when compared to the drill training method. Furthermore, the game training method has a greater effect on the age group 10-12 years compared to the age group 13-15 years. The results of this study can be concluded: (1) The game training method is better than the drill training method for improving basic tennis technical skills; (2) Athletes in the age group of 10-12 years have better improvement than athletes in the age group of 13-15 years to improve basic tennis technical skills and (3) there is an interaction effect between training methods and age group to improve basic tennis technical skills.