No. 6 seed Yuan Yue came back from down 3-0 in the second set to win the last six games of the match and defeat former world No. 1 Simona Halep on Monday in the opening round of the Hong Kong Open.
Poland's world number one Iga Swiatek swatted aside 25th seed Anastasia Pavlyuchenkova 6-4, 6-2 with a near-flawless performance to reach the round of 16 for a fourth straight year at the U.S. Open on Saturday.
Djokovic is clubbed with Federer, Juan Martin Del Potro, David Goffin and Alexander Zverev.
