Djokovic will next face Ernests Gulbis of Latvia, who shocked Juan Martin del Potro of Argentina 6-4, 6-4, 7-6 (3).

Sixth seed Milos Raonic of Germany, eighth seed Dominic Thiem of Austria, 10th seed Alexander Zverev of Germany and Spanish veteran David Ferrer also reached the third round.

On the women's side, third-seeded Karolina Pliskova of the Cezeh Republic suffered a shock defeat to Slovakia's Magdalena Rybarikova 3-6, 7-5, 6-2.

Pliskova said, "That's tennis, you know. Still, you still can play well and you don't have to win. That's my case today."

Top-seeded Angelique Kerber of Germany advanced to the third round, along with seventh-seeded Svetlana Kuznetsova of Russia, ninth-seeded Agnieszka Radwanska of Poland and 14th-seeded Garbine Muguruza of Spain.

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