Ben Shelton and Frances Tiafoe will continue their quest to become the first American men's Grand Slam champion since Andy Roddick's 2003 triumph at Flushing Meadows as the US Open reaches its semi-final stage.
Source: [Sky Sports](https://www.skysports.com/tennis/news/12040/13583808/us-open-is-mens-singles-victory-a-formality-for-alexander-zverev-or-will-ben-shelton-frances-tiafoe-or-karen-khachanov-trouble-him)