No 11 seed rallies for 5-7, 3-6, 7-5, 6-3, 7-6 (6) winTiafoe into third US Open semi-final in five yearsAmerican will play Alcaraz or Shelton in last fourAt the end of more than four and a half hours of escalating drama inside the world’s biggest tennis stadium, a devastated Alex Michelsen fell into Frances Tiafoe’s arms just outside the tramlines, sobbing uncontrollably. Frances Tiafoe comes from two sets and a break down to beat Alex Michelsen in a thrilling comeback to reach the US Open semi-finals. Key points and original sources are listed below.

• No 11 seed rallies for 5-7, 3-6, 7-5, 6-3, 7-6 (6) winTiafoe into third US Open semi-final in five yearsAmerican will play Alcaraz or Shelton in last fourAt the end of more than four and a half hours of escalating drama inside the world’s biggest tennis stadiu...S1

• Frances Tiafoe comes from two sets and a break down to beat Alex Michelsen in a thrilling comeback to reach the US Open semi-finals.S2