Sheltons first career retirement and Tiafoe loss leave US men reeling at Open

Shelton retires hurt in third-round matchTiafoe beaten by qualifier Struff in straightsFritz and Paul are last US men still aliveIt was a punishing Friday afternoon for American mens tennis as Ben Shelton and Frances Tiafoe were bundled out of the US Open less than an hour apart, leaving only Taylor Fritz and Tommy Paul still standing in the singles draw.Shelton, the No 6 seed and one of the leading contenders to end the United States 22-year wait for a mens grand slam champion, was forced to re...