Tennis Round is a messaging and discovery platform (website) for recreational tennis players, nationwide in the USA and around the world in over 6,000 cities. I proposed a set of designs for Tennis Round mobile app. The design focus on the core functionality of Tennis Round: messaging. Each screen is carefully designed to allow existing users in navigating through the app easily with consistent layout, clean design, and prominent Call-To-Actions. The design style for this app is highly influenced by Facebook Messenger.