Mosman Lawn Tennis Club has a long and proud association with the Sydney Badge Competition. Mosman enters Men’s and Ladies Badge teams in the Sydney Badge Competition. The format is doubles with each Mosman playing competitive tennis against other clubs each Saturday afternoon from 12.30pm.

Mosman Lawn also runs an internal Club Championships played amongst the clubs members each year to determine the Men’s and Women’s Singles and doubles Champions and well as the Mixed Double Champions.