Novak Djokovic admitted he was concerned by his physical difficulties after battling past young American Learner Tien in the opening round of the US Open. While a 6-1 7-6 (3) 6-2 scoreline may appear ...

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 ...