The CTA offers league play with...
San Diego Fall/Winter League http://www.sdleaguetennis.net/team.php
World Team Tennis (WTT) http://www.wtt.com/community
San Diego USTA League information http://www.sandiegotennis.com/leagues
United State Tennis Association (USTA) https://tennislink.usta.com/Leagues/Common/Default.aspx
San Diego District Tennis Association (SDDTA) https://www.sandiegotennis.com/
Friend at Court is the book of rules and regulations under which tennis is played in the United States. It includes the ITF Rules of Tennis, The Code, and USTA Regulations.