Various performance tests are applied to measure the technical competence of the athletes in tennis. One of them is the ITN (International Tennis Number) test. While the forehand, backhand, vole, service and mobility levels of the athletes are measured in the ITN test, the slice, drop shot, and lob techniques that are frequently used in tennis are not within the scope of this test. Although the matches are quite long, every number is important in tennis, where small differences in score determin ...