original_query: What is the premise of the teaching system for tennis employed by this individual?
query: What is the premise of Oscar Wegner's tennis teaching system?
answer: Wegner's system is based on the idea that players of all ages and skill levels can and should use the same techniques as top professionals.  It emphasizes open stance, hand-eye coordination, precise timing, and natural movement, summarized by the phrase "Find, Feel, Finish."