Young tennis players who play only 1 sport are more prone to injuries

http://www.eurekalert.org/pub_releases/2009-11/luhs-ytp102909.php

Single sport tennis players more prone to injuries.

According to a study presented at the International Society for Tennis Medicine and Science World Congress, playing one sport year round increases the risk of injury, particularly in young players. The study of 519 junior tennis players found that those who played only tennis were more likely to withdraw from tournaments for medical reasons, typically injuries. Athletes in the study generally began playing at age 6 and competing at age 10; they practiced an average of 16 to 20 hours per week and nearly all (93 percent) competed at least 10 months a year. Typical injuries included muscle strains, ankle sprains, hip injuries, patellar instability, spinal stress fractures, tendinitis of the wrist, and rotator cuff injuries.