You should migrate your Google Group in to Tennisopolis. This is way more fun and powerful. You will see more growth. You can create an EG Tennis Group and easily invite all the members.
Welcome to Tennisopolis! I created this tennis community so that people could meet to talk about the pros or create a local group to find hitting partners. We launched just two weeks ago. So I guess that makes you a charter member. :-)
Look through the Groups to see if there is already a group forming in your area. If there's not, don't hesitate to start your own.
There's a lot of fun to be had on Tennisopolis. A good place to start is by customizing your page and adding a picture.