You can play 1 set, best of 3, or best of 5. Choose whether you are serving first and the app will take the scoring from there. An announcer will let you know what the score is, when it's game point, set point, match point, whether you should switch sides, and more. If not, that information is available on the watch. Slide to the left to see the current score, and a breakdown of total points, games, and sets. The app will also save a Tennis activity to your Activities/Health app. This activity session allows the app to remain active and play audio in the background which allows you to play music in the "Now Playing" view and hear the announcer.