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The world number two, wearing a knee support, looked to be moving comfortably as he saw off Kopriva 6-1 6-2 6-2 on Centre Court in just under two hours.

Djokovic got his first real test just four games in but fought to get an all-important break at the sixth attempt before winning the next three games to take the first set.

Kopriva had no answers to Djokovic's aggressive serves, and giving up two more breaks on his own, failed to mount any real challenge during the second.

It was the same story in the third set, as the seven-time champion won the last four games in a row to set up a meeting with Jacob Fearnley or Alejandro Moro Canas in the next round