Sport law in the USA is not an easy task, since it covers multitude areas of law, such as torts, contracts, IP, anti-trust, , labor law and thus many level governments (FEDERAL/STATES/LOCAL) may have jurisdiction in its elaboration.
Also to note that over the years, the U.S. Congress has gotten involved in the sports world, by introducing legislation and conducting hearings on topics such as anti-doping, work stoppages in professional sports. .
An example :Report to the Congress: Former NFL Players: Disabilities, Benefits, and Related Issues
About the NCAA (as per their website)
Founded more than one hundred years ago as a way to protect student-athletes, the NCAA continues to implement that principle with increased emphasis on both athletics and academic excellence.
The NCAA is made up of three membership classifications that are known as Divisions I, II and III. Each division creates its own rules governing personnel, amateurism, recruiting, eligibility, benefits, financial aid, and playing and practice seasons – consistent with the overall governing principles of the Association. Every program must affiliate its core program with one of the three divisions.
The NCAA oversees 89 championships in 23 sports. There are more than 400,000 student-athletes competing in three divisions at over 1,000 colleges and universities within the NCAA.
2011-2012 Sports Law Year in Review Presented at Annual Sports Lawyers Association Conference, May 2012 Professor Gabe Feldman, Tulane Law School