Djokovic, 37, had a knee operation after pulling out before his French Open quarter-final -- sparking fears he would not be fit in time for Wimbledon, where he is chasing a record-equalling eighth men's title.

But although he wore a support on his right knee he showed no sign of discomfort in dispatching Czech qualifier Vit Kopriva 6-1, 6-2, 6-2.

The Serbian world number two, who was beaten by Carlos Alcaraz in last year's final, did not face a single break point during his cruise.

He knows time is not on his side as he bids to equal Roger Federer's Wimbledon title haul and also become the first player -- man or woman -- to win 25 Grand Slam singles titles.

"I tried to really focus on the game and not think about the knee too much," said Djokovic.

"Everything that I could do, I have done over the last three weeks along with my team to be able to play here for you today.

"I think if it was for any other tournament I probably would not have risked it, would not have rushed as much but I just love Wimbledon, love coming back here."