Team Italy's lead singles players, Matteo Berrettini and Martina Trevisan test their knowledge of each other's games at the #UnitedCup 🙌 SUBSCRIBE: http://bit.ly/2dj6EhW WEBSITE: http://www.atptour.com/ FACEBOOK: https://www.facebook.com/ATPTour/ TWITTER: https://twitter.com/ATPTour INSTAGRAM: https://www.instagram.com/atptour/ About the Official ATP Tour YouTube Channel: As the global governing body of men’s professional tennis, the ATP’s mission is to serve tennis. We entertain a billion global fans, showcase the world’s greatest players at the most prestigious tournaments, and inspire the next generation.