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/

Please see important documents below.