US Open title defence ends as Djokovic departs to boos after retiring hurt

The Serbians title defence came to a halt when he retired from his fourth-round match against Stan Wawrinka due to a shoulder injury Novak Djokovic was cruelly booed off the court at Arthur Ashe Stadium after a sore left shoulder forced his stunning retirement from Sunday nights fourth-round match with Stan Wawrinka at the US Open. The top seed and defending champion was trailing 6-4, 7-5, 2-1 after being comprehensively outplayed by the 23rd-seeded Wawrinka when he informed his opponent then chair umpire Nico Helwerth he could no longer continue, prompting a cascade of jeers from the nearly full 23,771-seat arena and leaving the world No 1 to raise a thumbs-up to the gallery as he hauled his equipment bags …