Watch extended highlights from Monday's action at the Cincinnati Open, where Jannik Sinner, Taylor Fritz, Frances Tiafoe and Holger Rune reached the fourth round. #CincyTennis #tennis #atptour #sinner #fritz #tiafoe #rune #highlights #cincinnati SUBSCRIBE: bit.ly/2dj6EhW WEBSITE: atptour.com FACEBOOK: facebook.com/ATPTour TWITTER: twitter.com/ATPTour INSTAGRAM: 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.