Del Potro relishing US Open quarter-final with 'greatest guy in history' Federer - video

Juan Martín del Potro produced a superb comeback to beat Dominic Thiem over five sets and set up a US Open quarter-final meeting with Roger Federer. The 2009 champion was hampered by illness and won only three games in the opening two sets. Federer eased past Philipp Kohlschreiber 6-4 6-2 7-5 to reach the final eight, with their match set to be a repeat of the 2009 final. Juan Martín del Potro beats fever and Thiem in thriller to set up Federer match