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Deuce is a tennis scorekeeper for Apple Watch and iPhone. While playing in a tennis match, keep track yourself by tapping the top half of the screen when your opponent scores and tapping the bottom half when you score. Deuce takes into account the length of your match that you set, whether you're playing advantage or tiebreaker sets, and randomly determines who serves first while keeping track of who's serving throughout the match. You can also have someone else keep score for you from your paired iPhone, which syncs to your Apple Watch, or you can score someone else's game with just an iPhone and no paired Watch.