Novak Djokovic eased through to the second round of the French Open after a straight-sets win over Rogerio Dutra Silva.
The Serbian, coming back from an injury absence which has seen him dip out of the world's top 20 for the first time since he was a teenager, dropped his serve in the opening game of the match.
But it proved a false alarm as the 12-time grand slam winner brushed aside his Brazilian opponent 6-3 6-4 6-4.
While a routine victory over the world number 134 may not be proof that Djokovic is ready to mount a sustained challenge to Rafael Nadal for the Roland Garros crown, it was at least an encouraging start for the 2016 champion.
Former champion Stan Wawrinka was knocked out of the French Open in the first round when he lost 6-2 3-6 4-6 7-6(5) 6-3 to Spain's Guillermo Garcia-Lopez.
The Swiss, who lifted the Musketeers Cup in 2015, led two sets to one but faded away after losing the fourth-set tiebreak.
Wawrinka, seeded 23rd in Paris, has been clawing his way back to the top after undergoing two knee surgeries last Summer.
Marco Trungelliti took a nine-hour drive from Barcelona to Paris on Sunday, and it proved well worth it.
The 28-year-old Argentinian, who lost in French Open qualifying last week, got an 11th-hour chance to figure in the main draw as the highest ranked 'lucky loser'.
Trungelliti had already travelled home to Spain but - after a spate of first-round withdrawals - he got the call to replace Nick Kyrgios on Sunday morning.
He arrived in Paris just before midnight, registered on Monday morning and walked out on court nine to face Australian former world number 17 Bernard Tomic.
And Trungelliti, who had earned £26,250 so far this year, will now pocket at least double that after battling to a surprise 6-4 5-7 6-4 6-4 victory.
Seventh seed Dominic Thiem, who lifted his second title of the season in Lyon last week, raced to a 6-2 6-4 6-1 victory over Belarusian Ilya Ivashka.
The two-time French Open semi-finalist will next face promising Greek teenager Stefanos Tsitsipas.
"He's one very good, upcoming player. Going to be top 10, for sure, in the future and playing already unbelievable," Thiem said. "But, yeah, hope that I can have an advantage over best of five."
Cypriot Marcos Baghdatis suffered an emotional meltdown after he retired hurt against Santiago Giraldo of Colombia.
Baghdatis, the 2006 Australian Open finalist, was leading 6-3 4-3 when he struggled to move on court before asking for a medical timeout. The 32-year-old broke down in tears and went on to smash his racquet while waiting for the physiotherapist to arrive.
After losing the first two points on his serve in the eighth game, Baghdatis decided to pull the plug on his campaign.
