What you have described is something that happens frequently, and people resolve it simply by communicating via messaging apps. Without intending to discourage your project, I doubt that most sports enthusiasts will seek matches on a website. However, if there is a system of elo, rankings, and points, whether between players or teams, it may be more effective. It reminded me that there are soccer goalkeepers who operate this way, not through a website, but by offering their services for friendly matches through all kinds of social media.