Tiafoe v Shelton US Open semi-final a legacy of the departing Gaël Monfils

<p>Veteran Frenchman bowed out in New York but the clash of two black players in the last four of the men’s singles is testament to his effect</p><p>The early days of this year’s US Open can be told in a series of farewells to competitors who plan to end their careers this year. Th