The Serbian triumphed 6-0 6-2 6-3 on Court Philippe-Chatrier in just 98 minutes.

After winning a match that saw him convert nine of 11 break points, Djokovic will meet Ricardas Berankis or Hugo Dellien in the second round.

As he looks to put his US Open disqualification for inadvertently hitting the ball at a line judge behind him, Djokovic is seen as the main challenger to 12-time champion Rafael Nadal, who had started his tournament with a straight-sets win a day earlier.

The first-ever meeting between Djokovic and Ymer in Paris on Tuesday was one-sided throughout and a story of total dominance in the opening set.

World number one Djokovic, who won his first Rome title for five years as preparation for the last grand slam of the year, dropped just seven points and had the lead after only 22 minutes.

It looked like more of the same in the second set when Ymer was broken in the third game and, despite the Swede striking straight back, it ultimately proved that way as the relentless 2016 champion did not allow him to get a foothold in the contest.

Ymer showed some fight again in the third, breaking Djokovic having earlier fallen behind to bring it back to 3-3.

But Djokovic, who only allowed two break points in the match and lost both, reeled off three consecutive games and sealed a straightforward victory on his first match point with a forehand winner.