Plan your training sessions or competitive team matches.
Do you still use MS Excel to plan your winter training season, or use Whatsapp every week to find out who's playing the next training?
Create one or more training groups.
Use the auto planner or self organize your trainings.
Players can join or leave sessions any time and there is a way to join as a backup in case you have time, but are willing to leave your spot for someone else.
Organize recurring tennis sessions with your group.