Forget Mountainview , there is nothing going on there.
Email this guy he runs a clinic on Monday nights at Phoenix tennis Center firstname.lastname@example.org
. One is for 3.0-3.5 followed by a 4.0-4.5 clinic. You can meet some people there and hook up later on in the week.
Kiwanis tennis center in Tempe has very good drop in tennis. I believe it is every day of the week.