The Strengths of the USTA NTRP System
The NTRP system was invented by the USTA Education and Research (E&R) office in 1978. The USTA officially created the league system the following year in 1979. The formalization of league play, as enabled by the NTRP system, fueled an explosive boom in USTA membership. Level-based play was the key to drawing increased and widespread participation in the sport.