Novak Djokovic overpowered Rogerio Dutra Silva in straight sets to move into the second round of the French Open on Monday.
Djokovic, the 12-time grand slam winner, eased past the Brazilian opponent, 6-3, 6-4, 6-4, but did not always look comfortable doing it.
"Experience helps," Djokovic said. "Especially in the early rounds. I've played many times here. I'm still a bit rusty on the court. I need to get some things to a higher level."
Djokovic is returning from a hiatus prompted by an elbow injury and is seeded 20th at Roland Garros.
"You don't get to feel always your best but at the end of the day you try to get the best out of it."
Stan Wawrinka, on the other hand, is out of the Open after a first-round, five-set loss to Guillermo Garcia Lopez of Spain.
Wawrinka needed extended treatment during the first set but battled for almost three-and-a-half-hours before dropping an epic match.
Lopez beat the No. 30-seed Wawrinka 6-2, 3-6, 4-6, 7-6 (5), 6-3.
Wawrinka, who is battling knee issues, failed to consistently land his serve and had 72 unforced errors. The three-time Grand Slam winner finished as runner-up last year.
"I know exactly where I want to be. I won three Grand Slams in my career and I know what it takes to do it. And my goal is to get to my top (level). Sooner or later I will be (there)," Wawrinka said. "My knee is good. I'm happy with that. That's really positive to see, but it's been now a few weeks that I'm feeling great with that sort of injury I did. So that's good. I'm in the right way, and I need to keep pushing."
Later in the day, American Sam Querrey beat countryman Frances Tiafoe 6-1, 6-2, 7-6 (6) to advance to Round 2.
--Field Level Media