US Open: Novak Djokovic Reaches Round Of 16 With Win Over Kei Nishikori

Novak Djokovic moved within four matches of completing the first men's singles calendar-year Grand Slam in 52 years.

Novak Djokovic moved within four matches of completing the first men's singles calendar-year Grand Slam in 52 years while top-ranked Ashleigh Barty was ousted by a stunning fightback from American Shelby Rogers. World number one Djokovic defeated Kei Nishikori 6-7 (4/7), 6-3, 6-3, 6-2, taking his 17th consecutive victory over the Japanese star and improving to 18-2 in their overall rivalry. "I was very pleased with the focus," Djokovic said. "Maybe at some points I wasn't my best, but I was determined and focused and that made the difference." With a fourth career US Open trophy, Djokovic would complete the first men's singles sweep of major titles in the same year since Rod Laver in 1969. Djokovic marched toward a 21st career Grand Slam title, which would break the deadlock for the men's record he shares with Rafael Nadal and Roger Federer, both absent with injuries. The 34-year-old Serbian star advanced to a fourth-round matchup on Monday against 99th-ranked US wildcard Jenson Brooksby.