Below are a few helpful links:
Tennis-Austin.com – Find a local hitting partner, join ladders and leagues, or sign up for lessons.
TennisMaps.com – Map of public tennis courts in Austin with info such as cost and whether there are lights.
Capital Area Tennis Association – Information on participating in USTA leagues and tournaments, as well as a variety of other resources for tennis players.
University of Texas Rec Sports racquetball – Information on becoming a member of UT Rec Sports and accessing campus racquetball facilities.