Djokovic largely cruised to a 6-1, 7-6, 6-2 win over 19-year-old American Learner Tien Sunday night to advance to the second round. But he struggled mid-match as Tien pushed him to a second-set tie ...

Novak Djokovic admits physical ‘concern’ after first-round win in New York - Djokovic struggled in the second set of his 6-1 ...