All eyes on Americans Frances Tiafoe and Taylor Fritz at US Open

Frances Tiafoe advances to the men’s semifinals to face Taylor Fritz, guaranteeing one American will be playing for a title while Emma Navarro has advanced to her first Grand Slam semifinal. Subscribe to ABC News on YouTube: ABC News Digital is your daily source of breaking national and world news, exclusive interviews and 24/7 live streaming coverage. Download the ABC News app for the latest headlines and alerts: Watch 24/7 coverage of breaking news and live events on ABC News Live: Watch full episodes of World News Tonight with David Muir here: Read ABC News reports online: ABC News is the home to the #1 evening newscast “World News Tonight” with David Muir, “Good Morning America,” “20/20,” “Nightline,” “This Week” wi