Tennis is the most popular racquet sport in the world with over 75 million participants, 15,000 of whom are certified teaching professionals registered with the world’s largest tennis-teaching organization, the United States Professional Tennis Association (USPTA). 23,28 In 2003, more than 36,000 people were treated in an emergency department for racquet and volley sport injuries, resulting ...
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5070495