Djokovic storms to 70th win at Roland Garros
The top seed went level with Roger Federer for career victories at the tournament, still 25 behind Rafael Nadal's all-time best.
Djokovic, the 2016 champion, and chasing an 18th Grand Slam title, will face Colombian lucky loser Daniel Elahi Galan, ranked 153, for a place in the last 16.
"It was difficult for Ricardas in the third set as he had an injury and couldn't move very well," said Djokovic whose quickfire 83-minute win was eased by his opponent needing treatment on a back injury after the second set.
"But I felt good just as I did in the first round and I want to continue like that."
Djokovic also only dropped five games in his first round match against Mikael Ymer who likened facing the Serb to a "shark killing its prey".