US Open: Novak Djokovic lets emotions show as Grand Slam nears

Taking another step in his bid to complete the first calendar-year Slam by a man in more than a half-century, Djokovic moved into the fourth round at Flushing Meadows for the 14th consecutive appearance, coming back to beat Kei Nishikori 6-7 (4), 6-3, 6-3, 6-2 on Saturday