I am Martin Vlach, and I put together I'll Play (illplay.org) as a hobby project to help a bunch of tennis buddies set up matches at the West Hills and Mountain Park (WAM Clubs) tennis clubs.
Joining is easy:
When you create an account, you’ll share a phone number, an email address, or both so that your tennis buddies can send you match updates. In your profile, you can choose your preferred contact method — text, email, or both — so you never miss a set.
Decide you want to hang up your racket, temporarily or permanently? No worries - you can suspend or delete your account anytime.
While running this app does have some costs to it, I offer it for free as a gift to my tennis buddies.