Most times tennis players and athletes in general finish the competition unhappy about their performance. They feel that the potential was there, but a hidden force prevented them from achieving a "feel-good" performance. Performances, however, are never usually black and white. Most times athletes feel as though they were going through flows, flash-in/flash-out phases. Falls during performance are conventionally defined "slumps" and are among the most hated between athletes, above all when they feel that the main reason for slumps is not due to technical, tactical or athletic flash-outs...